Added Ruby 2.0.0-p0

http://svn.ruby-lang.org/repos/ruby/tags/v2_0_0_0/ChangeLog

Requesting a pull to wayneeseguin/rvm from bousquet/200p0
http://www.ruby-lang.org/en/news/2013/02/24/ruby-2-0-0-p0-is-released/