Update coffee-script.js

update to v1.6.2 (copied from https://github.com/jashkenas/coffee-script/blob/master/extras/coffee-script.js)
update tests to v1.6.2

classes.coffee fails, all others pass.
How to upgrade CoffeeScript note
Merge pull request #3 from maphew/master

update to CoffeeScript v1.6.2