remove .sass-cache folder, we shouldn’t be tracking something like ths, since it gets updated so often and is "temporary" or throw away files
include additional compass settings in compass.rb

The compass.rb file has additional compass settings that help with generated images and the paths that compass creates.
The gruntfile.js has been updated to reference that file

See more information here: https://github.com/yeoman/yeoman/issues/419
Merge pull request #1 from benkutil-teaching/master

Possible fix for relative image problem