Added an unfinished doc on how groupchats work.
Cut bitrate by half for 1 channel audio.
Merge branch 'master' into debian/unstable
prepare for release

Signed-off-by: Kill Your TV <killyourtv@i2pmail.org>
Merge tag 'debian/0.0.0+20141117.r2949-1' into ubuntu/trusty

toxcore Debian release 0.0.0+20141117.r2949-1
prepare for release

Signed-off-by: Kill Your TV <killyourtv@i2pmail.org>