Fix: Added .litcoffee compile support (CoffeeScript 1.5.0)

Added litcoffee support took a little more then I hoped for... In the command line you can use `coffee -c somefile.litcoffee` but in code you have to say it is a literate file:

    compilers.litcoffee = (path) ->
      cs.compile(fs.readFileSync(path, 'utf8'), filename: path, literate: true)

I tested it, and it works now. Sorry for the last pull request which was untested.