Exporting angular.mock instead of module.exports of angular-mocks

angular-mocks.js is not exporting anything and therefore it would be nice to shim the export by exporting angular.mock which is the mock namespace (containing angular.mock.inject, angular.mock.module etc).
Merge pull request #2 from gionkunz/patch-1

Exporting angular.mock instead of module.exports of angular-mocks