Add vectors to define levels for various fields necessary for class definitions. Generalise initialization and modify by moving to the super class. Allow for non-existant fields in field_corrections method of super class. Cache entities retrieved using the get_entity method. Avoid uncessarily refreshing of entity when using defaultView active field of GaView class. Add skeleton class definitions for remaining GA Management API resources and collections.
Add vectors to define levels for various fields necessary for class definitions.
Generalise initialization and modify by moving to the super class.
Allow for non-existant fields in field_corrections method of super class.
Cache entities retrieved using the get_entity method.
Avoid uncessarily refreshing of entity when using defaultView active field of GaView class.
Add skeleton class definitions for remaining GA Management API resources and collections.

maraschin0/ganalytics,thunder112358/ganalytics,agarbuno/ganalytics