django-model

Adds a new Django model, that maps CloseIO to Django fields.
It includes a separate manager and pseudo decorators for field mapping
as well as mapping functions.

UnitTests for Django model wrapper

tests
 - model loading from closeIO
 - model saving
 - model loading form db
 - field mapping
 - custom field mapping
 - value conversion between db and closeIO
 - lazy loading of closeio values for existing objects