Improving error message to help debugging http://cl.ly/image/0C2d3V1P0e2v/Screen%20Shot%202014-05-22%20at%204.51.15%20PM.png

Adding the filename in the error message for easier debugging

Making pass jshint

Small fix

Added support for css files loaded through a server that gzip the content

Making jshint happy

Making sure the tests pass
Added test
Merge branch 'xdamman-fix/error-msg'