Adding subversion client
Merge pull request #37 from python/feature/subversion

Adding subversion client
Never show non-published Releases on the /downloads/ pages.

Fixes #162.
Merge pull request #185 from birkenfeld/dont-show-unpublished-downloads

Never show non-published Releases on the /downloads/ pages.
Fix OS detection for Linux/X11 to show the "source" box.

Also change references to the now-defunct "Linux" OS to "Source release".
Merge pull request #184 from birkenfeld/linux-vs-source-fix

Fix OS detection for Linux/X11 to show the "source" box.