Syntax colouring update

Hi Daniel,

Could you please consider including this pull-request?

Jeremy's CoffeeScript.tmLanguage evolved a bit last last year, so in Sublime Text, IcedCoffeeScript syntax colouring is not consistent with CoffeeScript anymore...

So I just adapted from Jeremy's current CoffeeScript.tmLanguage.

I only tested in Sublime but I expect everything will be fine in TextMate too. 

Thanks!