release: Allow specifying a branch to cut the release from.
release: Allow specifying a branch to cut the release from.

Signed-off-by: James McCoy <91ae71a1168cea0b65ac9975da69d5a7753116be@users.sourceforge.net>

frumiousbandersnatch/supybot-code,haxwithaxe/supybot,Ban3/Limnoria,ProgVal/Limnoria-test,Ban3/Limnoria,ProgVal/Limnoria-test,jeffmahoney/supybot,buildbot/supybot