Release 2 - 2011-12-10 - Converted compiler to coffeescript and refactored the code generation out into a separate object

This release is mainly a refactoring of the compiler with the eventual goal to be able to support haml in other languages that execute in a Javascript interpreter. One of the near term goals is to support coffeescript.

The following issues have been fixed since the 1.1 release:

Fix to prevent 0 values being rendered as empty string (thanks to Yongmin Xia)
Merged pull request from makevoid
Modified underscore string escapeHTML to convert apostrophes to ' instead of ' to support rendering in IE7

The following HAML options have NOT been implemented:

HAML Options
#{} interpolation
Attribute Methods
Doctype: !!!
Filters
Multiline: |

All the other features should work as documented in the HAML reference.