Coloring strings like constants
Removing the CoffeeScript prototype of the NetLogo Ace mode

The CoffeeScript version attempted at a bunch of features that I'm not going to bother trying to get working for the time being.  They can be revisited later.  Overall, I'm scrapping the CoffeeScript version, though, because I can't seem to get it to work.  My suspicion is that it has to do with the way Ace dynamically loads files, and the fact that the compiled output of CoffeeScript files gets enclosed in a closure.  I don't think it's a big deal if modes in JS, anyway....
Updating theme to properly color constants
Updating commentary
Getting syntax coloring of primitives working
No more Ace print margins