Added getAvailableVersions endpoint to the charmstore api
Added getAvailableVersions endpoint to the charmstore api

mitechie/juju-gui,jrwren/juju-gui,bac/juju-gui,mitechie/juju-gui,bac/juju-gui,bac/juju-gui,mitechie/juju-gui,mitechie/juju-gui,jrwren/juju-gui,bac/juju-gui,jrwren/juju-gui,jrwren/juju-gui