diff --git a/composer.json b/composer.json
index 9293d011e..2ed48998a 100644
--- a/composer.json
+++ b/composer.json
@@ -26,10 +26,10 @@
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-        "kevinrob/guzzle-cache-middleware": "^1.4.1",
-        "predis/predis": "^1.0"
+    "suggest": {
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+        "kevinrob/guzzle-cache-middleware": "(^1.4.1) Recommended for performance when using the default FeatureRequester",
+        "predis/predis": "(^1.0) Required when using LDDFeatureRequester"
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diff --git a/composer.lock b/composer.lock
index 6796b4600..1e40df487 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,21 +4,20 @@
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-    "content-hash": "12982c87565739e6a9c652a75ee41de6",
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-                "reference": "bad29cb8d18ab0315e6c477751418a82c850d558",
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@@ -83,7 +82,7 @@
                 "logging",
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-            "time": "2016-11-26 00:15:39"
+            "time": "2017-03-13T07:08:03+00:00"
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@@ -130,7 +129,7 @@
                 "psr",
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-            "time": "2016-10-10 12:19:37"
+            "time": "2016-10-10T12:19:37+00:00"
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     "packages-dev": [
@@ -191,7 +190,7 @@
                 "cli",
                 "microframework"
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-            "time": "2014-03-29 14:03:13"
+            "time": "2014-03-29T14:03:13+00:00"
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@@ -250,22 +249,25 @@
                 "service-provider",
                 "silex"
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-            "time": "2012-12-19 10:50:58"
+            "time": "2012-12-19T10:50:58+00:00"
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             "name": "container-interop/container-interop",
-            "version": "1.1.0",
+            "version": "1.2.0",
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                 "url": "https://github.com/container-interop/container-interop.git",
-                "reference": "fc08354828f8fd3245f77a66b9e23a6bca48297e"
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-                "reference": "fc08354828f8fd3245f77a66b9e23a6bca48297e",
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@@ -277,20 +279,21 @@
                 "MIT"
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-            "time": "2014-12-30 15:22:37"
+            "homepage": "https://github.com/container-interop/container-interop",
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@@ -299,7 +302,7 @@
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@@ -345,7 +348,7 @@
                 "docblock",
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-            "time": "2016-12-30 15:59:45"
+            "time": "2017-02-24T16:22:25+00:00"
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@@ -399,7 +402,7 @@
                 "constructor",
                 "instantiate"
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-            "time": "2015-06-14 21:17:01"
+            "time": "2015-06-14T21:17:01+00:00"
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@@ -453,20 +456,20 @@
                 "lexer",
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-            "time": "2014-09-09 13:34:57"
+            "time": "2014-09-09T13:34:57+00:00"
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-            "version": "1.6.1",
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                 "url": "https://github.com/erusev/parsedown.git",
-                "reference": "20ff8bbb57205368b4b42d094642a3e52dac85fb"
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@@ -495,25 +498,25 @@
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                 "url": "https://github.com/guzzle/guzzle.git",
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-                "guzzlehttp/psr7": "^1.3.1",
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@@ -557,7 +560,7 @@
                 "rest",
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-            "time": "2016-10-08 15:01:37"
+            "time": "2017-02-28T22:50:30+00:00"
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@@ -608,20 +611,20 @@
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-            "time": "2016-12-20 10:07:11"
+            "time": "2016-12-20T10:07:11+00:00"
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@@ -657,28 +660,35 @@
                     "name": "Michael Dowling",
                     "email": "mtdowling@gmail.com",
                     "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Tobias Schultze",
+                    "homepage": "https://github.com/Tobion"
                 }
             ],
-            "description": "PSR-7 message implementation",
+            "description": "PSR-7 message implementation that also provides common utility methods",
             "keywords": [
                 "http",
                 "message",
+                "request",
+                "response",
                 "stream",
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+                "uri",
+                "url"
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             "version": "1.0.3",
             "source": {
                 "type": "git",
-                "url": "https://github.com/kherge-abandoned/php-json.git",
+                "url": "https://github.com/kherge-php/json.git",
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@@ -726,7 +736,8 @@
                 "schema",
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-            "time": "2013-10-30 16:51:34"
+            "abandoned": "kherge/json",
+            "time": "2013-10-30T16:51:34+00:00"
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@@ -783,7 +794,8 @@
                 "phar",
                 "update"
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-            "time": "2013-10-30 17:23:01"
+            "abandoned": true,
+            "time": "2013-10-30T17:23:01+00:00"
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@@ -834,7 +846,7 @@
                 "xml",
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-            "time": "2016-12-05 10:18:33"
+            "time": "2016-12-05T10:18:33+00:00"
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@@ -869,20 +881,20 @@
                 "Apache2"
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-            "time": "2012-11-18 18:08:43"
+            "time": "2012-11-18T18:08:43+00:00"
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-            "version": "1.4.2",
+            "version": "1.6.2",
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                 "url": "https://github.com/schmittjoh/serializer.git",
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@@ -895,6 +907,7 @@
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@@ -904,20 +917,23 @@
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-                "symfony/validator": "^2.2",
-                "symfony/yaml": "^2.1",
+                "symfony/form": "~2.1|^3.0",
+                "symfony/translation": "^2.1|^3.0",
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+                "symfony/yaml": "^2.1|^3.0",
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             "suggest": {
+                "doctrine/cache": "Required if you like to use cache functionality.",
+                "doctrine/collections": "Required if you like to use doctrine collection types as ArrayCollection.",
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@@ -944,7 +960,7 @@
                 "serialization",
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-            "time": "2016-11-13 10:20:11"
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@@ -1010,7 +1026,7 @@
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-            "time": "2016-01-25 15:43:01"
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@@ -1088,7 +1104,7 @@
                 "rfc7234",
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-            "time": "2017-01-16 07:02:13"
+            "time": "2017-01-16T07:02:13+00:00"
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@@ -1130,20 +1146,21 @@
             ],
             "description": "A parsing and comparison library for semantic versioning.",
             "homepage": "http://github.com/kherge/Version",
-            "time": "2012-08-16 17:13:03"
+            "abandoned": true,
+            "time": "2012-08-16T17:13:03+00:00"
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@@ -1172,7 +1189,7 @@
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@@ -1217,7 +1234,7 @@
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-            "time": "2015-09-19 14:15:08"
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@@ -1265,7 +1282,7 @@
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@@ -1308,7 +1325,7 @@
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@@ -1349,7 +1366,7 @@
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@@ -1438,7 +1455,7 @@
                 "documentation",
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@@ -1492,7 +1509,7 @@
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@@ -1541,7 +1558,7 @@
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@@ -1591,31 +1608,31 @@
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@@ -1654,7 +1671,7 @@
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@@ -1717,7 +1734,7 @@
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-                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/e8bb9de52febc4ee9922b33b1f04ba5feed457b8",
-                "reference": "e8bb9de52febc4ee9922b33b1f04ba5feed457b8",
+                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/9e4369666d02ee9b8830da878b7f6a769eb96f4b",
+                "reference": "9e4369666d02ee9b8830da878b7f6a769eb96f4b",
                 "shasum": ""
             },
             "require": {
@@ -3223,7 +3297,7 @@
             ],
             "description": "Symfony Stopwatch Component",
             "homepage": "https://symfony.com",
-            "time": "2017-01-02 20:30:24"
+            "time": "2017-02-18T17:06:33+00:00"
         },
         {
             "name": "symfony/translation",
@@ -3287,20 +3361,20 @@
             ],
             "description": "Symfony Translation Component",
             "homepage": "https://symfony.com",
-            "time": "2016-07-30 07:22:48"
+            "time": "2016-07-30T07:22:48+00:00"
         },
         {
             "name": "symfony/validator",
-            "version": "v2.8.16",
+            "version": "v2.8.19",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/validator.git",
-                "reference": "3b1a3188efea75ec7c0419a2568b6e5f82031811"
+                "reference": "43f617ee200af4f4dedbb0782c6c689e06994286"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/validator/zipball/3b1a3188efea75ec7c0419a2568b6e5f82031811",
-                "reference": "3b1a3188efea75ec7c0419a2568b6e5f82031811",
+                "url": "https://api.github.com/repos/symfony/validator/zipball/43f617ee200af4f4dedbb0782c6c689e06994286",
+                "reference": "43f617ee200af4f4dedbb0782c6c689e06994286",
                 "shasum": ""
             },
             "require": {
@@ -3311,13 +3385,13 @@
             "require-dev": {
                 "doctrine/annotations": "~1.0",
                 "doctrine/cache": "~1.0",
-                "egulias/email-validator": "~1.2,>=1.2.1",
+                "egulias/email-validator": "^1.2.1",
                 "symfony/config": "~2.2|~3.0.0",
                 "symfony/expression-language": "~2.4|~3.0.0",
                 "symfony/http-foundation": "~2.3|~3.0.0",
-                "symfony/intl": "~2.7.4|~2.8|~3.0.0",
+                "symfony/intl": "~2.7.25|^2.8.18|~3.2.5",
                 "symfony/property-access": "~2.3|~3.0.0",
-                "symfony/yaml": "~2.0,>=2.0.5|~3.0.0"
+                "symfony/yaml": "^2.0.5|~3.0.0"
             },
             "suggest": {
                 "doctrine/annotations": "For using the annotation mapping. You will also need doctrine/cache.",
@@ -3360,20 +3434,20 @@
             ],
             "description": "Symfony Validator Component",
             "homepage": "https://symfony.com",
-            "time": "2017-01-12 19:24:25"
+            "time": "2017-03-23T16:08:03+00:00"
         },
         {
             "name": "symfony/yaml",
-            "version": "v3.2.2",
+            "version": "v3.2.7",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "50eadbd7926e31842893c957eca362b21592a97d"
+                "reference": "62b4cdb99d52cb1ff253c465eb1532a80cebb621"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/50eadbd7926e31842893c957eca362b21592a97d",
-                "reference": "50eadbd7926e31842893c957eca362b21592a97d",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/62b4cdb99d52cb1ff253c465eb1532a80cebb621",
+                "reference": "62b4cdb99d52cb1ff253c465eb1532a80cebb621",
                 "shasum": ""
             },
             "require": {
@@ -3415,33 +3489,34 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2017-01-03 13:51:32"
+            "time": "2017-03-20T09:45:15+00:00"
         },
         {
             "name": "twig/twig",
-            "version": "v1.31.0",
+            "version": "v1.33.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/twigphp/Twig.git",
-                "reference": "ddc9e3e20ee9c0b6908f401ac8353635b750eca7"
+                "reference": "dd6ca96227917e1e85b41c7c3cc6507b411e0927"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/twigphp/Twig/zipball/ddc9e3e20ee9c0b6908f401ac8353635b750eca7",
-                "reference": "ddc9e3e20ee9c0b6908f401ac8353635b750eca7",
+                "url": "https://api.github.com/repos/twigphp/Twig/zipball/dd6ca96227917e1e85b41c7c3cc6507b411e0927",
+                "reference": "dd6ca96227917e1e85b41c7c3cc6507b411e0927",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.2.7"
             },
             "require-dev": {
+                "psr/container": "^1.0",
                 "symfony/debug": "~2.7",
-                "symfony/phpunit-bridge": "~3.2"
+                "symfony/phpunit-bridge": "~3.3@dev"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.31-dev"
+                    "dev-master": "1.33-dev"
                 }
             },
             "autoload": {
@@ -3476,7 +3551,7 @@
             "keywords": [
                 "templating"
             ],
-            "time": "2017-01-11 19:36:15"
+            "time": "2017-04-20T17:39:48+00:00"
         },
         {
             "name": "zendframework/zend-cache",
@@ -3545,7 +3620,7 @@
                 "cache",
                 "zf2"
             ],
-            "time": "2016-12-16 11:35:47"
+            "time": "2016-12-16T11:35:47+00:00"
         },
         {
             "name": "zendframework/zend-config",
@@ -3601,7 +3676,7 @@
                 "config",
                 "zf2"
             ],
-            "time": "2016-02-04 23:01:10"
+            "time": "2016-02-04T23:01:10+00:00"
         },
         {
             "name": "zendframework/zend-eventmanager",
@@ -3655,7 +3730,7 @@
                 "events",
                 "zf2"
             ],
-            "time": "2016-12-19 21:47:12"
+            "time": "2016-12-19T21:47:12+00:00"
         },
         {
             "name": "zendframework/zend-filter",
@@ -3715,7 +3790,7 @@
                 "filter",
                 "zf2"
             ],
-            "time": "2016-04-18 18:32:43"
+            "time": "2016-04-18T18:32:43+00:00"
         },
         {
             "name": "zendframework/zend-hydrator",
@@ -3773,7 +3848,7 @@
                 "hydrator",
                 "zf2"
             ],
-            "time": "2016-02-18 22:38:26"
+            "time": "2016-02-18T22:38:26+00:00"
         },
         {
             "name": "zendframework/zend-i18n",
@@ -3840,44 +3915,39 @@
                 "i18n",
                 "zf2"
             ],
-            "time": "2016-06-07 21:08:30"
+            "time": "2016-06-07T21:08:30+00:00"
         },
         {
             "name": "zendframework/zend-json",
-            "version": "2.6.1",
+            "version": "3.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/zendframework/zend-json.git",
-                "reference": "4c8705dbe4ad7d7e51b2876c5b9eea0ef916ba28"
+                "reference": "f42a1588e75c2a3e338cd94c37906231e616daab"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/zendframework/zend-json/zipball/4c8705dbe4ad7d7e51b2876c5b9eea0ef916ba28",
-                "reference": "4c8705dbe4ad7d7e51b2876c5b9eea0ef916ba28",
+                "url": "https://api.github.com/repos/zendframework/zend-json/zipball/f42a1588e75c2a3e338cd94c37906231e616daab",
+                "reference": "f42a1588e75c2a3e338cd94c37906231e616daab",
                 "shasum": ""
             },
             "require": {
                 "php": "^5.5 || ^7.0"
             },
             "require-dev": {
-                "fabpot/php-cs-fixer": "1.7.*",
                 "phpunit/phpunit": "~4.0",
-                "zendframework/zend-http": "^2.5.4",
-                "zendframework/zend-server": "^2.6.1",
-                "zendframework/zend-stdlib": "^2.5 || ^3.0",
-                "zendframework/zendxml": "^1.0.2"
+                "squizlabs/php_codesniffer": "^2.3",
+                "zendframework/zend-stdlib": "^2.7 || ^3.0"
             },
             "suggest": {
-                "zendframework/zend-http": "Zend\\Http component, required to use Zend\\Json\\Server",
-                "zendframework/zend-server": "Zend\\Server component, required to use Zend\\Json\\Server",
-                "zendframework/zend-stdlib": "Zend\\Stdlib component, for use with caching Zend\\Json\\Server responses",
-                "zendframework/zendxml": "To support Zend\\Json\\Json::fromXml() usage"
+                "zendframework/zend-json-server": "For implementing JSON-RPC servers",
+                "zendframework/zend-xml2json": "For converting XML documents to JSON"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.6-dev",
-                    "dev-develop": "2.7-dev"
+                    "dev-master": "3.0-dev",
+                    "dev-develop": "3.1-dev"
                 }
             },
             "autoload": {
@@ -3895,42 +3965,42 @@
                 "json",
                 "zf2"
             ],
-            "time": "2016-02-04 21:20:26"
+            "time": "2016-04-01T02:34:00+00:00"
         },
         {
             "name": "zendframework/zend-serializer",
-            "version": "2.7.2",
+            "version": "2.8.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/zendframework/zend-serializer.git",
-                "reference": "95385c2342fc335d5164eb95ac3ca230aa51223b"
+                "reference": "ff74ea020f5f90866eb28365327e9bc765a61a6e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/zendframework/zend-serializer/zipball/95385c2342fc335d5164eb95ac3ca230aa51223b",
-                "reference": "95385c2342fc335d5164eb95ac3ca230aa51223b",
+                "url": "https://api.github.com/repos/zendframework/zend-serializer/zipball/ff74ea020f5f90866eb28365327e9bc765a61a6e",
+                "reference": "ff74ea020f5f90866eb28365327e9bc765a61a6e",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.5 || ^7.0",
-                "zendframework/zend-json": "^2.5",
+                "php": "^5.6 || ^7.0",
+                "zendframework/zend-json": "^2.5 || ^3.0",
                 "zendframework/zend-stdlib": "^2.7 || ^3.0"
             },
             "require-dev": {
-                "fabpot/php-cs-fixer": "1.7.*",
                 "phpunit/phpunit": "^4.5",
+                "squizlabs/php_codesniffer": "^2.3.1",
                 "zendframework/zend-math": "^2.6",
                 "zendframework/zend-servicemanager": "^2.7.5 || ^3.0.3"
             },
             "suggest": {
-                "zendframework/zend-math": "(^2.6) To support Python Pickle serialization",
-                "zendframework/zend-servicemanager": "To support plugin manager support"
+                "zendframework/zend-math": "(^2.6 || ^3.0) To support Python Pickle serialization",
+                "zendframework/zend-servicemanager": "(^2.7.5 || ^3.0.3) To support plugin manager support"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.7-dev",
-                    "dev-develop": "2.8-dev"
+                    "dev-master": "2.8-dev",
+                    "dev-develop": "2.9-dev"
                 },
                 "zf": {
                     "component": "Zend\\Serializer",
@@ -3952,7 +4022,7 @@
                 "serializer",
                 "zf2"
             ],
-            "time": "2016-05-11 16:05:56"
+            "time": "2016-06-21T17:01:55+00:00"
         },
         {
             "name": "zendframework/zend-servicemanager",
@@ -4004,7 +4074,7 @@
                 "servicemanager",
                 "zf2"
             ],
-            "time": "2016-12-19 19:14:29"
+            "time": "2016-12-19T19:14:29+00:00"
         },
         {
             "name": "zendframework/zend-stdlib",
@@ -4063,7 +4133,7 @@
                 "stdlib",
                 "zf2"
             ],
-            "time": "2016-04-12 21:17:31"
+            "time": "2016-04-12T21:17:31+00:00"
         },
         {
             "name": "zetacomponents/base",
@@ -4126,7 +4196,7 @@
             ],
             "description": "The Base package provides the basic infrastructure that all packages rely on. Therefore every component relies on this package.",
             "homepage": "https://github.com/zetacomponents",
-            "time": "2014-09-19 03:28:34"
+            "time": "2014-09-19T03:28:34+00:00"
         },
         {
             "name": "zetacomponents/document",
@@ -4177,7 +4247,7 @@
             ],
             "description": "The Document components provides a general conversion framework for different semantic document markup languages like XHTML, Docbook, RST and similar.",
             "homepage": "https://github.com/zetacomponents",
-            "time": "2013-12-19 11:40:00"
+            "time": "2013-12-19T11:40:00+00:00"
         }
     ],
     "aliases": [],
diff --git a/src/LaunchDarkly/GuzzleFeatureRequester.php b/src/LaunchDarkly/GuzzleFeatureRequester.php
index c1cc7b419..af3e006df 100644
--- a/src/LaunchDarkly/GuzzleFeatureRequester.php
+++ b/src/LaunchDarkly/GuzzleFeatureRequester.php
@@ -17,14 +17,22 @@ class GuzzleFeatureRequester implements FeatureRequester
     private $_baseUri;
     /** @var array  */
     private $_defaults;
-    /** @var  LoggerInterface */
+    /** @var LoggerInterface */
     private $_logger;
+    /** @var boolean */
+    private $_loggedCacheNotice = FALSE;
 
     function __construct($baseUri, $sdkKey, $options)
     {
         $this->_baseUri = $baseUri;
+        $this->_logger = $options['logger'];
         $stack = HandlerStack::create();
-        $stack->push(new CacheMiddleware(new PublicCacheStrategy(isset($options['cache']) ? $options['cache'] : null), 'cache'));
+        if (class_exists('Kevinrob\GuzzleCache\CacheMiddleware')) {
+            $stack->push(new CacheMiddleware(new PublicCacheStrategy(isset($options['cache']) ? $options['cache'] : null), 'cache'));
+        } else if (!$this->_loggedCacheNotice) {
+            $this->_logger->info("GuzzleFeatureRequester is not using an HTTP cache because Kevinrob\GuzzleCache\CacheMiddleware was not installed");
+            $this->_loggedCacheNotice = TRUE;
+        }
 
         $this->_defaults = array(
             'headers' => array(
@@ -35,7 +43,6 @@ function __construct($baseUri, $sdkKey, $options)
             'timeout' => $options['timeout'],
             'connect_timeout' => $options['connect_timeout']
         );
-        $this->_logger = $options['logger'];
         $this->_client = new Client(['handler' => $stack, 'debug' => false]);
     }
 
@@ -56,9 +63,9 @@ public function get($key)
         } catch (BadResponseException $e) {
             $code = $e->getResponse()->getStatusCode();
             if ($code == 404) {
-                $this->_logger->warning("GuzzleFeatureRetriever::get returned 404. Feature flag does not exist for key: " . $key);
+                $this->_logger->warning("GuzzleFeatureRequester::get returned 404. Feature flag does not exist for key: " . $key);
             } else {
-                $this->_logger->error("GuzzleFeatureRetriever::get received an unexpected HTTP status code $code");
+                $this->_logger->error("GuzzleFeatureRequester::get received an unexpected HTTP status code $code");
             }
             return null;
         }
@@ -77,7 +84,7 @@ public function getAll() {
             return array_map(FeatureFlag::getDecoder(), json_decode($body, true));
         } catch (BadResponseException $e) {
             $code = $e->getResponse()->getStatusCode();
-            $this->_logger->error("GuzzleFeatureRetriever::getAll received an unexpected HTTP status code $code");
+            $this->_logger->error("GuzzleFeatureRequester::getAll received an unexpected HTTP status code $code");
             return null;
         }
     }