Provide a function.bind shim, until phantomjs is updated.

@@ -423,6 +423,28 @@ module.exports = function (grunt) {
             });
             var requireCallback = function requireCallback(mpConfigBase, withCoverage) {
                 /* global requirejs:false */
+                Function.prototype.bind = function bind() {
+                    if (typeof this !== 'function') {
+                        // closest thing possible to the ECMAScript 5
+                        // internal IsCallable function
+                        throw new TypeError('Function.prototype.bind - what is trying to be bound is not callable');
+                    }
+
+                    var aArgs   = Array.prototype.slice.call(arguments, 1),
+                    fToBind = this,
+                        fNOP    = function() {},
+                        fBound  = function() {
+                            return fToBind.apply(this, aArgs.concat(Array.prototype.slice.call(arguments)));
+                        };
+
+                    if (this.prototype) {
+                        // Function.prototype doesn't have a prototype property
+                        fNOP.prototype = this.prototype;
+                    }
+                    fBound.prototype = new fNOP();
+
+                    return fBound;
+                };
                 requirejs.load = (function(oldLoad) {
                     return function (context, moduleName, url) {
                         //console.log('context=' + JSON.stringify(arguments), 'moduleName=' + moduleName, 'url=' + url);