Added CSS to gitIgnore. Project uses less.

Added CSS to .gitIgnore to prevent future tracking of changes as this
project compiles them from .less files. Every time I run the service
GitHub detects css file changes even when they are identicle. This will
only be an issue should this project choose to replace BootStrap, at
which point the changes would be pretty dramatic.
Merge pull request #3 from KeyboardG/master

Added CSS to gitIgnore. Project uses less.