* Removed support and examples for AdWords v201509.
* The AdWords ReportDownloader now accepts a "client_customer_id" keyword
argument that overrides the default client customer ID.
* For utilities such as the ReportDownloader or BatchJobHelper, data points
about usage are now sent in the user-agent of API requests by default. This
can be disabled with the new include_utilities_in_user_agent configuration in
the googleads.yaml file.
* Added a new parallel_report_download.py example.
* Resolved issues:
Issue 122: https://github.com/googleads/googleads-python-lib/issues/122
Issue 123: https://github.com/googleads/googleads-python-lib/issues/123