Ability to add a primative $or condition through EMongoCriteria
Abstracted the document field cache mechanism to the EMongoClient
Added count() function to the EMongoDocument
Doc change to count()
Fixed bug with EMongoClient
Added EMongoCriteria support and soft deprecated the getMongoId()
function and stopped reliance on it internally. See:
https://github.com/Sammaye/MongoYii/pull/38 and
https://github.com/Sammaye/MongoYii/issues/40
Bug fix after some testing of closer integration of EMongoCriteria
Merge remote-tracking branch 'upstream/master'

Conflicts:
	EMongoModel.php