Allow queries by sub_admin_code.

Update Issue 701
Status: Fixed
Labels: Milestone-1.8.2
Improve Google V3 API key instructions.

Update Issue 699
Status: Fixed

More research revealed that we do want the 'key' argument and not
'client'. It works, but the instructions must be followed exactly. I've
added more detail to the inline instructions.
Version 1.8.2