Add support for IE 11 masking as other browsers.

Closes #57.

Author: bnjmnt4n

platform.js

@@ -711,7 +711,7 @@
       description.unshift('desktop mode');
       version || (version = (/\brv:([\d.]+)/.exec(ua) || 0)[1]);
     }
-    // Detect IE 11.
+    // Detect IE 11 identifying as other browsers.
     else if (name != 'IE' && layout == 'Trident' && (data = /\brv:([\d.]+)/.exec(ua))) {
       if (name) {
         description.push('identifying as ' + name + (version ? ' ' + version : ''));
@@ -776,6 +776,14 @@
         }
         version = name == 'IE' ? String(version[1].toFixed(1)) : version[0];
       }
+      // Detect IE 11 masking as other browsers.
+      else if (typeof doc.documentMode == 'number' && /^(?:Chrome|Firefox)\b/.test(name)) {
+        description.push('masking as ' + name + ' ' + version);
+        name = 'IE';
+        version = '11.0';
+        layout = ['Trident'];
+        os = 'Windows';
+      }
       os = os && format(os);
     }
     // Detect prerelease phases.

test/test.js

@@ -1311,6 +1311,24 @@
       'version': '11.0'
     },
 
+    'IE 11.0 (masking as Chrome 28.0.1500.95) on Windows': {
+      'ua': 'Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.95 Safari/537.36',
+      'layout': 'Trident',
+      'mode': 11,
+      'name': 'IE',
+      'os': 'Windows',
+      'version': '11.0'
+    },
+
+    'IE 11.0 (masking as Firefox 12.0) on Windows': {
+      'ua': 'Mozilla/5.0 (Windows NT 6.2; rv:12.0) Gecko/20100101 Firefox/12.0',
+      'layout': 'Trident',
+      'mode': 11,
+      'name': 'IE',
+      'os': 'Windows',
+      'version': '11.0'
+    },
+
     'IE Mobile 4.01 on Windows CE': {
       'ua' : 'Mozilla/4.0 (compatible; MSIE 4.01; Windows CE; PPC; 240x320)',
       'layout': 'Trident',