started adding parent for hierarchical modeling, need to modify get_by_id()
GET works, need to work on POST
separated CRUD from controllers
changed to ndb
added ability to query from references instead of ancestor
corected a few bugs for the query process and JSON encoding of ndb.Key
Club is added when new Trainer is added, few corrected bugs when querying for default entities
resource routing
progress on new querying model, added routes for notifications
corrected bug for notifications, added mixin for model and polymodel
Rename API to REST_API

rename to allow merge on mac os...
Merge pull request #19 from damienfir/issue/17-consistency

Looks good to me, did some tests on issue/20 and most things look good