VERIFY_ONLY fails slowly - fixes #24

```
$ grunt jsbeautifier:verify
Running "jsbeautifier:verify" (jsbeautifier) task

Warning: The following files were not beautified:
app/assets/javascripts/global-vars.js.erb
app/views/community_properties/_review_action.js.erb
 Use --force to continue.

Aborted due to warnings.

$ grunt jsbeautifier:modify
Running "jsbeautifier:modify" (jsbeautifier) task
Beautified 38 files, changed 2 files...OK

Done, without errors.

$ grunt jsbeautifier:verify
Running "jsbeautifier:verify" (jsbeautifier) task
Beautified 38 files, changed 0 files...OK

Done, without errors.
```