update composer to stable from dev.
Create Attributes . So now when I have a User entity I don't need to call the api a 2nd time for the device relationship I can get access the device property on the User model e.g.: $user->device; and the SDK will take care of the 2nd API call on my behalf.
Also added new response models so groups and roles and notifications and notifiers are all typed model response so they no longer return a entity model but a correctly typed models e.g.: Roles returns a roles model.
Also when asking a Response model for its entities property it now returns the correct model of the correct type: e.g. before this change when asking a user model for its entity you would get the base php collection model class now you get the Typed PHP Collection class so asking a User response for its entities property you get back a Users PHP collection class not BaseCollection class.
All notification endpoints are now mapped. You can send to  user , users, group, groups, device, devices can all be targeted for a push notiifcation.
Merge remote-tracking branch 'apps4u/master' into apache_usergrid/master