gruntjs/grunt-contrib-compress — pull request #51 by unbalanced (2013-06-03 10:37:04+00:00)
Title: Custom file extension for the output file

Regarding:
https://github.com/gruntjs/grunt-contrib-compress/issues/50

Hope you'll find this useful. For now it helps my workflow a little :)
I'll be happy to elaborate on why i choose this approach and collaborate on that if you'd want.

Thanks