Added Sublime Text 3 support

Alright so I know there has been some discussion about how to [handle this](https://github.com/boxen/our-boxen/issues/377).

My PR only works if the repo name is changed to `puppet-sublime_text`

```puppet
# ST3
include sublime_text

# ST2
include sublime_text::v2
```

I'm open to suggestions on how to change this.

Another solution I can think of is leaving this repo so that we don't break dependencies, and then on the README just forward them to the `puppet-sublime_text`.