Added variable detection to SCSS. Improved function detection.
Added phrasal English words to boost relevance in comments. Fixes #213.
Redefined AVR asm directives as keywords.

Generalized '\.[A-Za-z0-9]+' gives too much relevance to dot-access in other languages. One way to deal with it was to give relevance only if this is found at the beginning of a line but current parser implementation prevents that: testRe loses string context.
added every conceivable css unit (for reference - http://www.w3.org/TR/css3-values/)
limited function highlighting to just the name
Merge pull request #365 from BennettJames/scss_fixes

A Few Improvements to SCSS Mode
Removing special-casing of numbers in CSS values in a number of styles.
Merge https://github.com/isagalaev/highlight.js into Dart