Comment 4 for bug 1200878

As there is still no upgrade path for environments created with py-juju to juju-core, I'm going to re-introduce the juju-0.7 package to saucy so we don't shoot all the existing juju environments that are already in use.

juju-core will still be the default juju implementation for saucy; however switching to the python implementation should be supported to allow people time to switch over prior to 14.04 when I would like to drop py-juju.