Built with new coffee, fixed repo.showFile

I set out to fix a problem I saw in the ProjectRepository#showFile function (viz., it was submitting a post instead of a get, and it was requiring projectId in the arg list and in the params object), but when I built from src, it built with the new CoffeeScript, and I figured it'd be a good opportunity to update that too.

I ran the tests (*all 12 of them....*) and they are passing. If you would like, I can write a test for the showFile function as well.