Added --no-header option for Coffeescript

--no-header, suppresses the "Generated by" header
Merge pull request #2 from kriswallsmith/master

Removed the download of the cssembed jar as the url does not work anymor...
Added test for --no-header functionality
Merge pull request #630 from jeroenvisser101/patch-1

Added --no-header option for Coffeescript