Security, feature, and bug fix release

Bodhi 2.2.0 is a security and feature release, with a few bug fixes as well.

This update addresses CVE-2016-1000008 by
disallowing the re-use of solved captchas. Additionally, the captcha is
warped to make it more difficult to
solve through automation. Thanks to Patrick Uiterwijk for discovering and reporting this issue.

If you would like to read about the features and bugs fixed by this release, please see the release notes.