Stylus-mode highlighting suggestions

[jmafc]

In the README, you state that "I'm not sure yet how to highlight .styl files", so here is a suggestion:

https://cdn.tutsplus.com/webdesign/uploads/2014/01/formatted.png

That image is from Why Choose Stylus (And You Should Too) and shows the highlighting applied by the Sublime Text Stylus package. There are further examples in the article.

[watzon]

I was going to add an issue, but I'll just put this here instead since it's relevant. Variables like what I have in the following picture are valid, however right now stylus-mode seems to be doing sass style variable highlighting.