Fixes error where app module cannot be imported

When calling `module()` with `inject()`, an error is thrown:
```
Error: [$injector:modulerr] Failed to instantiate module ng due to:
TypeError: 'undefined' is not an object (evaluating
'Function.prototype.bind.apply')
```

PhantomJS is not amongst Karma's officially supported browsers.
In 1.x, `Function.prototype.bind` isn't defined. Instead of polyfilling,
or using Phantom 2.x, it is better to stick with supported browsers.

(As an aside, the test was masking over the error. A more specific
error, or a message assertion would be better practice).

Author: kanhirun

karma-dist-concatenated.conf.js

@@ -17,7 +17,6 @@ module.exports = function(config) {
       'karma-chai',
       'karma-sinon-chai',
       'karma-chrome-launcher',
-      'karma-phantomjs-launcher',
       'karma-jquery',
       'karma-chai-jquery'
     ],
@@ -67,7 +66,7 @@ module.exports = function(config) {
 
     // start these browsers
     // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
-    browsers: ['PhantomJS'],
+    browsers: ['Chrome'],
 
 
     // Continuous Integration mode

karma-dist-minified.conf.js

@@ -17,7 +17,6 @@ module.exports = function(config) {
       'karma-chai',
       'karma-sinon-chai',
       'karma-chrome-launcher',
-      'karma-phantomjs-launcher',
       'karma-jquery',
       'karma-chai-jquery'
     ],
@@ -67,7 +66,7 @@ module.exports = function(config) {
 
     // start these browsers
     // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
-    browsers: ['PhantomJS'],
+    browsers: ['Chrome'],
 
 
     // Continuous Integration mode

karma-src.conf.js

@@ -15,7 +15,7 @@ module.exports = function(config) {
     plugins: [
       'karma-jasmine',
       'karma-sinon-chai',
-      'karma-phantomjs-launcher',
+      'karma-chrome-launcher',
       'karma-spec-reporter'
     ],
 
@@ -65,7 +65,7 @@ module.exports = function(config) {
 
     // start these browsers
     // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
-    browsers: ['PhantomJS'],
+    browsers: ['Chrome'],
 
 
     // Continuous Integration mode

test/unit/angular-zendesk-widget/zendeskWidgetSpec.js

@@ -8,7 +8,7 @@ describe('Angular Zendesk Widget', function() {
       module('zendeskWidget');
       expect(function() {
         inject()
-      }).toThrow();
+      }).toThrowError('Missing accountUrl. Please set in app config via ZendeskWidgetProvider');
     });
 
   });