Adding es6-shim for IE.

Author: hansl

test/karma.conf.js

@@ -14,12 +14,14 @@ module.exports = function(config) {
       require('karma-sauce-launcher'),
     ],
     files: [
+      {pattern: 'node_modules/es6-shim/es6-shim.js', included: true, watched: true},
       {pattern: 'node_modules/angular2/bundles/angular2-polyfills.js', included: true, watched: true},
       {pattern: 'node_modules/systemjs/dist/system-polyfills.js', included: true, watched: true},
       {pattern: 'node_modules/systemjs/dist/system.src.js', included: true, watched: true},
       {pattern: 'node_modules/rxjs/bundles/Rx.js', included: true, watched: true},
       {pattern: 'node_modules/angular2/bundles/angular2.js', included: true, watched: true},
       {pattern: 'node_modules/angular2/bundles/testing.dev.js', included: true, watched: true},
+      {pattern: 'node_modules/angular2/bundles/testing.dev.js', included: true, watched: true},
 
       {pattern: 'test/karma-test-shim.js', included: true, watched: true},