Log Message:
py-google-api-python-client: update to 1.6.6.

v1.6.6
  Version 1.6.6

  Bugfix release

  - Warn when constructing BatchHttpRequest using the legacy batch URI (#488)
  - Increase the default media chunksize to 100MB. (#482)
  - Remove unnecessary parsing of mime headers in HttpRequest.__init__ (#467)