Add 'get milestones' for repo api

doc/repos.md

@@ -249,3 +249,11 @@ use Github\HttpClient\Message\ResponseMediator;
 $data = $client->getHttpClient()->get('/repositories/24560307');
 $repo = ResponseMediator::getContent($data);
 ```
+
+### Get the milestones of a repository
+
+```php
+milestones = $client->api('repo')->milestones('ornicar', 'php-github-api');
+```
+
+Returns a list of milestones.

lib/Github/Api/Repo.php

@@ -463,4 +463,14 @@ public function merge($username, $repository, $base, $head, $message = null)
             'commit_message' => $message
         ));
     }
+
+    /**
+     * @param string $username
+     * @param string $repository
+     * @return array
+     */
+    public function milestones($username, $repository)
+    {
+        return $this->get('repos/'.rawurldecode($username).'/'.rawurldecode($repository).'/milestones');
+    }
 }

test/Github/Tests/Api/RepoTest.php

@@ -188,6 +188,22 @@ public function shouldGetRepositoryLanguages()
         $this->assertEquals($expectedArray, $api->languages('KnpLabs', 'php-github-api'));
     }
 
+    /**
+     * @test
+     */
+    public function shouldGetRepositoryMilestones()
+    {
+        $expectedArray = array('milestone1', 'milestone2');
+
+        $api = $this->getApiMock();
+        $api->expects($this->once())
+            ->method('get')
+            ->with('repos/KnpLabs/php-github-api/milestones')
+            ->will($this->returnValue($expectedArray));
+
+        $this->assertEquals($expectedArray, $api->milestones('KnpLabs', 'php-github-api'));
+    }
+
     /**
      * @test
      */