Update process docs: vivid is no longer necessary in order to run GUI charm functional tests.
Update process docs: vivid is no longer necessary in order to run GUI charm functional tests.

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