fix require() calls with casper's patched require. CoffeeScript is now b...

Tests were broken with Casper 1.1.0 and PhantomJS 1.9. I'm not sure what you plan for a versioning story, but perhaps you can tag the Casper 1.0 & PhantomJS 1.7 compatible versions, and master can continue forward with the latest version. I'll update this pull requests to have it check those respective versions

Also coffee-script isn't required either as it's built into phantomjs now, so you can just require() those.