Homebrew/homebrew — pull request #26388 by havenwood (2014-02-03 21:50:32+00:00)
Title: Update url to project's new location.

As per the notification on http://pyyaml.org/: "Moving to BitBucket. Please leave your bug reports there: PyYAML => http://bitbucket.org/xi/pyyaml; LibYAML => http://bitbucket.org/xi/libyaml."