chore(tests): use angular installed via npm

- Avoid maintaining / copying AngularJS source code on our repo.
- Ensures that Travis checks out the latest Angular version and tests
  against it.

Author: chrisirhc

karma.conf.js

@@ -16,8 +16,8 @@ module.exports = function(config) {
     // list of files / patterns to load in the browser
     files: [
       'misc/test-lib/jquery-1.8.2.min.js',
-      'misc/test-lib/angular.js',
-      'misc/test-lib/angular-mocks.js',
+      'node_modules/angular/angular.js',
+      'node_modules/angular-mocks/angular-mocks.js',
       'misc/test-lib/helpers.js',
       'src/**/*.js',
       'template/**/*.js'