Update karma to run both firefox & chrome tests

Author: benjaminapetersen

Diff for: package.json

@@ -41,6 +41,7 @@
     "jasmine-spec-reporter": "1.1.2",
     "jshint-stylish": "0.2.0",
     "karma": "0.12.23",
+    "karma-chrome-launcher": "^2.0.0",
     "karma-coverage": "0.2.6",
     "karma-firefox-launcher": "^1.0.0",
     "karma-jasmine": "0.1.5",

Diff for: test/karma.conf.js

@@ -79,10 +79,14 @@ module.exports = function(config) {
     // - Safari (only Mac)
     // - PhantomJS
     // - IE (only Windows)
-    browsers: ['Firefox'],
+    // default in karma.conf.js is Firefox, however, Chrome has much better
+    // error messages when writing tests.  Call with chrome like this:
+    //  browsers=Chrome grunt test
+    browsers: process.env.browsers ? [process.env.browsers] : ['Firefox'],
     // Which plugins to enable
     plugins: [
       'karma-firefox-launcher',
+      'karma-chrome-launcher',
       'karma-ng-html2js-preprocessor',
       'karma-jasmine',
       'karma-coverage'