Add packaging for newest ruby 1.9.3, 2.0.0 and 2.1 releases.

These releases include a DoS bugfix for REXML, and a [change to the openssl config to disable SSLv3 in the wake of POODLE](https://www.ruby-lang.org/en/news/2014/10/27/changing-default-settings-of-ext-openssl/).

Release notes:
* https://www.ruby-lang.org/en/news/2014/10/27/ruby-2-1-4-released/
* https://www.ruby-lang.org/en/news/2014/10/27/ruby-2-0-0-p594-is-released/
* https://www.ruby-lang.org/en/news/2014/10/27/ruby-1-9-3-p550-is-released/

Note: this PR also removes the packaging of 2.1.3.  This was only recently added, and is not yet used by any apps.  It's therefore not worth continuing to maintain now that 2.1.4 is out.