Change every mention of MAINTAINER to avoid future issues.

There is now a "latest" collection (or "latest_nsfw").
The feature didn't look much used, since it didn't work on many
backends.
Using collections will make it easy to support other things
like most viewed, featured, etc.
As a bonus, I added tests for every backend with the feature.

Laurent Bachelier authored Mar 12, 2012 and Romain Bignon committed Mar 13, 2012

And fix some PEP8 style issues (mostly about spaces) while I was there.

refs #806

Lord authored Mar 12, 2012 and Romain Bignon committed Mar 12, 2012

Signed-off-by: Lord <lord@lordtoniok.com>
Signed-off-by: Romain Bignon <romain@symlink.me>