Upgrade to 1.5.6a

1.5.6 is unstable, so I pushed git update to 1.5.6a
Mainly contains fixes for things that broke in recent Gmod updates.
1.5.6 compared to older versions has a different gamemode structure and
more features/content.
Oops

Fix for bodies was done server-side when it obviously should have been
done client-side.
Scold me as much as you like. :P