Maya separated from main.py
The menu-item is being added directly within the userSetup.py where it belongs (though using quite the hacky implementation, do have a look to see if you can improve).
Fixes #37 and moves default plugin registration into plugin-module.
Merge pull request #42 from mottosso/master

Merging and documenting "domain.py" a little better in Wiki.
https://github.com/abstractfactory/publish/wiki/Quickstart#domainpy