Updates Task.get and TaskController.get to work with session
Changes to Task.get filtering. Replaces cls.objects.filter with cls.objects.get
Merge branch 'tasks', remote-tracking branch 'origin' into tasks
Merge branch 'tasks' of github.com:techiev2/HaywireAPI into tasks
Merge branch 'master' into tasks
Uses __session_valid, __query, __session_user members populated by decorator

Ref: 19a0c7517171a40ea6da4aee02ad7075c0229acd for decorator changes
Fixtures for check_session decorator pertaining to TopLevelDocumentMetaclass
Merge branch 'tasks' of github.com:techiev2/HaywireAPI into tasks
Fixes Task.create flow to pick up session param