Store ext for later use.

My last request had a bug in it. I added this.ext and used it for selective logging. Then I accidentally removed it from the official pull request. I later use this.ext to determine whether to do coffee script compilation. I've checked this.meta and ext isn't directly available in it.
Retreat on coffee script raw file name.

Make the "raw" filename look like file-fingerprint.coffee_raw.js instead of file-fingerprint_raw.coffee.js.  There are too many other parts of the system that expect the raw file name to be related to the minified file-name in this way.
Merge pull request #28 from tylerpeterson/master

Bug fix: Store ext on content resolver.