Update "Getting Started" Contributing docs

As of March 2013, joining the openstack-cla team on Launchpad is no
longer required.

Change-Id: I342f9600c1b6689780086894746de70ea15577a5
Merge "Update "Getting Started" Contributing docs"
Fix floating IP management from instance panel.

Quantum Floating IP API works with ports ids not instances ones
(opposite to what Nova Network does). So if we want to associate
(disassociate) an allocated floating IP to some instance we must
use the "target_id" (which is a port_id in case of Quantum and an
instance_id in case of Nova network).

Fixes bug 1158596.

Change-Id: Iceba4d8ee74bd58dc1cdbda7668841b0a7eb86f1
Adding pagination to the instance views

Modifying the api.nova.server_list() method to optionally handle
pagination.  The method will also work without pagination to
support the many other place than the instance views that continue
to call the method.

Fixes: bug #1046915

Change-Id: I8195f1f2d8922e1722743d7a2d627a8645e8b3bd
Fix the "Updated" field in the Image Detail page

The "Updated" field in the Image Detail page always says
"Never Updated". It appears that the code is looking for
"updated_app" instead of "updated_at".

Fixes bug #1168613

Change-Id: I2582e76f80cfd37c46910b1d419489268bddb0f3