added variable and mixin. working on line comments and rules within mixins
stuck on nested syntax
inserted keywords
scss highlighting works, but conflicts sometimes with css. Added 'preprocessor' style into github.css and classref.txt. Added scss test case in test.html
scss test case
Merge branch 'master' of https://github.com/kemch/highlight.js into scss

Conflicts:
	src/styles/github.css
Zeroed relevance of "preprocessor" in SCSS
Added Kurt Emch to contributors
Shorter SCSS snippet