Emmet completions not supported inside <style lang="*"></style>.

Don't even know if this issue should be posted here or in the [emmet-sublime](https://github.com/sergeche/emmet-sublime) repository. But completions DO work with pure stylus or less files.

To reproduce:

```
<style lang="stylus">
    body
        m0  <-- press TAB here and nothing happens
</style>
```
