Added *.litcoffee support

Version 0.5.7 of Coffeelint adds support for .litcoffee files: https://github.com/clutchski/coffeelint/commit/c495246121cd8142ba80d7f8ec9f027e3f969fff.

This checks to see if the file is litcoffee and passes in the appropriate flag.
Merge pull request #24 from jonmumm/master

Added *.litcoffee support