Added function regex for (top level) coffeescript functions

[rwilcox]

This commit lets (top level) coffeescript functions to show up on the function menu in BBEdit, and be folded.

By top level I mean "functions not within other functions". So given the following functions

circumference = (r) -> pi -> return 3.14 pi * (r^2)

We will match circumference, but NOT pi.