Support coffee script in assemblies.

Detect a file has coffee script in it by checking that it's path ends with ".coffee"
Compile the code without a surrounding function so that all of the symbols are visible to the rest of the module. This is accomplished with the "bare" option to compile.
Add a header to the code to help reinforce that the code in the file is generated from coffee script and to make it obvious what version of coffee script was used.
Merge pull request #30 from tylerpeterson/master

Support coffee script in assemblies.