OpenShift AD DNS Plugin

Based on the nsupdate plugin (ruby193) I've created a new separate AD-specific plugin that I've tested and works (RHEL 6 + OSE with Windows 2008 R2 x64). There are a few caveats; when testing against OpenShift Enterprise I had to ensure that the gem was installed manually (gem install --local /path/to/gem) and the sources need to be manually placed into the rpmbuild/SOURCES directory as they don't currently exist within the OpenShift repo. 

I'm expecting for the integration testing to fail; I've not written a test-suite (yet) as it will be difficult to automate AD integration, hence I renamed the file .todo whilst I work on something.

Thanks,
Rhys. (roxenham@redhat.com)