Add support for IE11 [closes bestiejs#35]

Author: bnjmnt4n

platform.js

@@ -611,6 +611,11 @@
         )) {
       layout = [data];
     }
+    // detect IE 11 and above
+    if (!name && layout == 'Trident') {
+      name = 'IE';
+      version = (/\brv:([\d.]+)/.exec(ua) || 0)[1];
+    }
     // leverage environment features
     if (useFeatures) {
       // detect server-side environments

test/test.js

@@ -984,6 +984,14 @@
       'version': '10.0'
     },
 
+    'IE 11.0 on Windows 8.1': {
+      'ua': 'Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko',
+      'layout': 'Trident',
+      'name': 'IE',
+      'os': 'Windows 8.1',
+      'version': '11.0'
+    },
+
     'IE Mobile 4.01 on Windows CE': {
       'ua' : 'Mozilla/4.0 (compatible; MSIE 4.01; Windows CE; PPC; 240x320)',
       'layout': 'Trident',