Cakefile updated to support CoffeeScript 1.7.0+

As of [this PR](https://github.com/jashkenas/coffee-script/pull/3279),
CoffeeScript now requires Cakefiles to register their local coffee
installation as to ensure version compatibility.
Merge pull request #27 from leeolayvar/coffee170

Cakefile updated to support CoffeeScript 1.7.0+