this will break completion of names with `$` or require escaping
i was thinking to use data.completer check [above](https://github.com/danyaPostfactum/ace/blob/d276f10bcdc01b1928d4331523a0935c8fe0d8e8/lib/ace/autocomplete.js#L137) for this. 
Or maybe we can use if (data.meta == 'snippet') {}?