Update Havana Projects list

Add Ceilometer and Heat. Also add ceilometerclient/heatclient.
Resort the entries to match chronological order (as defined
in https://wiki.openstack.org/wiki/Projects) to make it easier
to grasp.

Change-Id: I9875a4ffa4f8dd6a8368a4aa9ce06f7f8640b153
Reviewed-on: https://review.openstack.org/31184
Reviewed-by: Sean Dague <sean@dague.net>
Approved: Monty Taylor <mordred@inaugust.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Tested-by: Jenkins