Description of problem:
you must currently know to use `rhc ssh <app> --gears 'tail -f jbosseap/logs/*';` in order to tail all the logs of all gears at once. This is not the most intuitive, though it does work well.
It would be far simpler to have an `rhc tail-all <app>` command.
Started this here https://github.com/openshift/rhc/pull/465 - needs net-ssh-multi packaged (in progress) and test cases to work.