Accessibility Theme for Ace

Adds a theme that adds accessibility to Ace. It uses the ChromeVox (http://www.chromevox.com/) API to read relevant parts of code. Here is the ChromeVox API reference: https://google-axs-chrome.googlecode.com/svn/trunk/developer/chromevox-api/cvox_api.html

There's a lot here to swallow. Let me know if you have any questions.

I'll be on IRC sometimes if you want a faster means of communication.