Remove drupalgap_system_connect_extras() and migrate it to drupalgap_services_request_postprocess_alter() and drupalgap_connect().

Bring drupalgap_system_connect_extras() back, but take in a reference to the service result. Change _drupalgap_resource_user_permissions() to include the user role name for anonymous and authenticated users.

Create _drupalgap_add_term_data_to_entities() and _drupalgap_add_term_data_to_entity() by removing them from drupalgap_services_request_postprocess_alter(), and then allow the comment index resource to attach taxonomy term names to result(s).