Consistent syntax highlighting + custom file icons

Syntax highlighting is now consistent across both light and dark themes.

###Darcula:

![](https://f.cloud.github.com/assets/2389211/522316/0b355422-c01d-11e2-8b06-f81a98d46613.png)

###Default:

![](https://f.cloud.github.com/assets/2389211/522317/1b233cc8-c01d-11e2-85a8-f52045f6e910.png)

Place holder file icons are also included. Both these are still in progress, but is decent enough to be an update.