Add build tab and cloud build jobs

Added some jobs for building a cloud, so you can do things like:

* Upload a cloud configuration
* Upload keys for Ansible to use
* Build a Eucalyptus cloud from source or packages using Ansible
* Rebuild hosts using cobbler (assuming you have cobbler set up this will use 'koan --replace-self' to rebuild using the associated profile for the host)

**NOTE**: This is still a work in progress and will probably need to tweak a few things here and there.