* Initial version of BigQuery group sync script.

* Formatted group_sync.py.

* Initial version with Cloud Functions, not able to call credentials.with_subject.

* Another attempt at making Cloud Functions work, by building service account credentials from compute engine credentials.

* Working with Cloud Functions

* Added (commented out) code for Cloud Identity API)

* Fixed bug in SA creation script

* Add project id to create_service_account.sh

* Add schedule creation script and minor code improvments.

* Add comments to variables in main and use PROJECT_ID in schedule_job

* Addressing some of the review comments.

* Add flag to use Cloud Identity and unit tests.