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* Fixed an issue where PQL fields weren't encoding properly / not handling None
responses correctly. This resolves issue 9.
* Fixed an issue where the AdWords ReportDownloader would fail when downloading
gzipped reports. Now better documents the need to use binary files in this
case. This resolves issue 6.
* Fixed an artifact from issue 5, ReportDownloader now sets https_proxy before
retrieving the WSDL.