using external compass config
removing sass folder from copy, as copying the sass files to the right css folder is handled by the config.rb now

removing web/sass folder from clean, as this one is not copied anymore.
moving bootstrap lib path to config.rb
using import "bootstrap" in layout.scss
Renaming variables in Gruntfile to be more expressive
Removing a few left-over clean:sass
Removing the added import for simplicity

This makes the layout.scss file easier to understand in my opinion. And the added import path
didn't really make our life much easier
Simplifying, updating and adding documentation to the config.rb file
Moving the Compass configuration file
Merge pull request #7 from knpuniversity/paschdan-external-config-for-compass

Updated external config for compass