Added 'Shuffle map rotation' host option, which never makes arena_ maps first
Add option to shuffle maps without bias (allowing arena_ map to be first)
Merge pull request #140 from TazeTSchnitzel/shuffle_maps

Added 'Shuffle map rotation' host option, which never makes arena_ maps first
Merge pull request #141 from TazeTSchnitzel/weeklyBackground

Check devmessages.txt for version, download/display menu background
Use an MD5 hash, not a numerical identifier, for backgrounds