Added an ACE adapter.

This still has the stuff you did to remove the irrelevant-to-me rich text stuff for the CodeMirror adapter, so I guess you don't want to merge it as-is. Not sure what you want to do! But the ACE support is in and working well in my testing. I did write it in CoffeeScript, but there is a generated JS file that could be adapted if you don't want to mix the two in the project.

![screenshot 2013-10-27 12 42 28](https://f.cloud.github.com/assets/99704/1416222/04dac8e4-3f40-11e3-9296-0111ae454358.png)