Add styles for Web Workbench and Web Essentials

Styling for less, sass, coffeescript and a couple of extra highlights from web essentials
Merge branch 'WebWorkbenchAndWebEssentials' of https://github.com/bdukes/visualstudio-colors-solarized into bdukes-WebWorkbenchAndWebEssentials

Conflicts:
	vs2012/solarized-dark.vssettings
	vs2012/solarized-light.vssettings