API docs for ContentSwapper.
setSwapContainer now accepts a CSS selector
Getters now return null if not found.
New: ModelSync.Zope

Created with the "yogi init" command
Added docs and testing
Removed a lot of unused features of ModelSync.REST which are
not used in Zope
I renamed modelsynczope to model-sync-zope to better follow YUI3 standards.
Merge pull request #2 from Satyam/master

API docs and enhancements to ContentSwapper