Adjust the replaygain plugin to the changes in threading
Improve conformance to PEP8, tidy up.
Unify comment style
Merge pull request #156 from zas/pep8_plugins

Improve conformance to PEP8, tidy up.
Add 'Audio' to the categories in the .desktop file

As per
http://blogs.gnome.org/hughsie/2013/09/03/broken-desktop-files/
it should have both 'AudioVideo' and one or both of 'Audio' or 'Video'
in order to be categorized correctly.
Merge pull request #157 from kepstin/desktop-fix

Add 'Audio' to the categories in the .desktop file