saltstack/salt — pull request #13803 by claytron (2014-06-27 17:49:45+00:00)
Title: Clarify version numbering scheme

Clarify the version numbering scheme based on the blog post on the subject.
http://www.saltstack.com/salt-blog/2013/10/27/salt-version-numbers
Reference the new document on the releases page and from the first date based release.
Also a minor fix for the docs make clean command so that it does not error out.