chore: add user agent sniffing for Edge browser

Author: Narretz

src/.jshintrc

@@ -11,6 +11,7 @@
     /* angular.js */
     "angular": false,
     "msie": false,
+    "edge": false,
     "jqLite": false,
     "jQuery": false,
     "slice": false,

src/Angular.js

@@ -3,6 +3,7 @@
 /* We need to tell jshint what variables are being exported */
 /* global angular: true,
   msie: true,
+  edge: true,
   jqLite: true,
   jQuery: true,
   slice: true,
@@ -151,6 +152,7 @@ if ('i' !== 'I'.toLowerCase()) {
 
 var
     msie,             // holds major version number for IE, or NaN if UA is not IE.
+    edge,             // true if Microsoft Edge browser. Holds no version number.
     jqLite,           // delay binding since jQuery could be loaded after us.
     jQuery,           // delay binding
     slice             = [].slice,
@@ -171,6 +173,7 @@ var
  */
 msie = window.document.documentMode;
 
+edge = window.navigator.userAgent.indexOf('Edge') > -1;
 
 /**
  * @private

test/.jshintrc

@@ -8,6 +8,7 @@
     /* angular.js */
     "angular": false,
     "msie": false,
+    "edge": false,
     "jqLite": false,
     "jQuery": false,
     "slice": false,