added elaborative styles for JS/CSS/SCSS and support for Dart

Better colours for JS. Added styles for static functions, instance methods, objects, regex etc.
![2014-09-19_18-40-49](https://cloud.githubusercontent.com/assets/3071948/4336019/ad67a536-4002-11e4-9be3-8374c38c7a1e.png)
Added support for Dart.
![2014-09-19_18-39-30](https://cloud.githubusercontent.com/assets/3071948/4336022/ad6ff5e2-4002-11e4-96ee-736b6f12ef8d.png)
SCSS
![2014-09-19_18-40-11](https://cloud.githubusercontent.com/assets/3071948/4336020/ad6ef214-4002-11e4-8b48-124df662d000.png)

with few other tweaks.