Log Message:
py-google-api-python-client: update to 1.7.1.

v1.7.1
  Version 1.7.1

  Bugfix release

  - Remove unnecessary check in setup.py (#518).

v1.7.0
  Version 1.7.0

  This release drops the hard requirement on oauth2client and installs
  google-auth by default instead. oauth2client is still supported but will
  need to be explicitly installed.

  - Drop oauth2client dependency (#499)
  - Include tests in source distribution (#514)