adding TextMate / SublimeText syntax highlights

For issue #57.

The `Kitten.JSON-tmLanguage` file is used to generate the `Kitten.tmLanguage` file, which is what the editor reads to provide syntax highlighting. I've included both here for convenience.

Here's what it looks like with the default theme in Sublime Text 2:
![screen shot](https://f.cloud.github.com/assets/82855/884180/8e479a2e-f9ab-11e2-992b-cf40206066cf.png)