JBoxUserV2

More expansive user schema

        - user_id (primary hash key)
        - create_month (global secondary hash key)
        - create_time (global secondary range index)
        - update_month  (global secondary hash key)
        - update_time (global secondary index)
        - activation_code (global secondary hash key)
        - activation_status (global secondary range key)
        - image (optional: global secondary hash key)
        - resource_profile (optional: global secondary range key)
        - status
        - organization
        - system_profile
        - gtok

Also moved models to db module