Update jenkins-plugin-runtime and jruby-openssl to fix #26

In order to fix #26 the Jenkins team must first accept the pull requests https://github.com/jenkinsci/jenkins.rb/pull/70 and https://github.com/stapler/stapler/pull/14.

I'm not sure if there's a cleaner way to handle this but after upgrading to jenkins-plugin-runtime 0.2.3 with vagrant-plugin I had to hand edit my config.xmls because they were referencing Jenkins::Plugin::Proxies::Builder instead of Jenkins::Tasks::BuilderProxy.

For users that are interested, I have built a custom version of the ruby-runtime plugin for Jenkins.  You can download [ruby-runtime.hpi](https://dl.dropbox.com/u/35989164/ruby-runtime.hpi) and [vagrant-plugin.hpi](https://dl.dropbox.com/u/35989164/vagrant.hpi) and install both of those plugins into Jenkins 1.505+.