Log Message:
py-google-api-python-client: updated to 1.12.3

1.12.3:

Bug Fixes
deps: update setup.py to install httplib2>=0.15.0

1.12.2:

Bug Fixes
add method to close httplib2 connections

1.12.1:

Bug Fixes
deps: require six>=1.13.0

1.12.0:

Features
add quota_project, credentials_file, and scopes support

Documentation
convert print statement to function
remove http from batch execute docs