Merge commit '0eb2b9fd17426d30bff6c017deb96606f3b090d3'

Fix variable reference

Add ability to specify form template. Closes powmedia#34.

Add editorAttrs, editorClass, fieldClass, fieldAttrs

Help text

Validation refactor
Error messages
New validators
Don't trigger multiple change events on commit
Documentation

Add templating and update for Backbone v0.9.1

For Backbone 0.5.1