readthedocs hook added to both Savanna projects

Change-Id: I20a7a5325b6506e9e321b169cef6e79a3d3327ed
Reviewed-on: https://review.openstack.org/27587
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: Monty Taylor <mordred@inaugust.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Tested-by: Jenkins