Open Stack

I've updated the information about how we make a new release and even 
added links to some liberty release changes for reference.

Please review
https://wiki.openstack.org/wiki/Documentation/Release#Cut_the_stable_branch

Feel free to update or ask questions about things that are not clear!

Andreas
-- 
  Andreas Jaeger aj@{suse.com,opensuse.org} Twitter/Identica: jaegerandi
   SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
    GF: Felix Imendörffer, Jane Smithard, Graham Norton,
        HRB 21284 (AG Nürnberg)
     GPG fingerprint = 93A3 365E CE47 B889 DF7F  FED1 389A 563C C272 A126