Stitch silently fails when a module isn't found for a compiler

[impressiver]

I was trying to figure out why stitch wasn't including my coffee scripts, and after a bit of googling I found this: https://github.com/maccman/spine.app/issues/3

Stitch silently fails when a module can't be loaded for a compiler. It would be nice to at least get a message saying it couldn't be loaded. Turned out to be my fault, I didn't have coffee-script installed in my global library, but this will bite all new coffee-script users.

Thanks
-ian