We can now load up a Compass config file!

Users can now create a _config/compass.rb file with all the normal
Compass configuration they're used to and we'll pick it up and send it
over to Compass.
Enable the Compass sprite importer, needed for magic sprites
Oops, wrong namespace
New quiet option during site gen

Warnings and errors will still be displayed.
Also, this doesn't affect the first time run, all that info will
continue to be displayed
Fixing up issues with Compass integration

Specifically this has to do with Sprites
Testing on version 1.9.3 of the 1.9 branch

Please be sure to use the latest version from 1.9