Added IE 10 and Opera testing

We are special casing Opera 12 as well as the latest Opera version
because Opera 12 was the last release because Opera switched to the
Webkit rendering engine.

Gruntfile.js

@@ -101,6 +101,10 @@ module.exports = function (grunt) {
               browserName: 'internet explorer',
               version: '9'
             },
+            {
+              browserName: 'internet explorer',
+              version: '10'
+            },
 
             {
               browserName: 'firefox'
@@ -108,6 +112,14 @@ module.exports = function (grunt) {
 
             {
               browserName: 'chrome'
+            },
+
+            {
+              browserName: 'opera',
+              version: '12'
+            },
+            {
+              browserName: 'opera'
             }
           ]
         }