Fix access to css/js/etc. files

Change-Id: I3c5596f181f403f13fde4146adfe9102bd301208
optionally install memcached python bindings for the session backend

Change-Id: I11c258659698b8ed8a0a5ec8c72a8107d80dfac7
Merge "Fix access to css/js/etc. files"
Template content tests

Changed some 'pending' template tests to check for attributes, defaults,
and platform specific changes.
Also, noticed that the spec memcached servers list was a string,
and the template uses .each, so I changed it to an array.
And changed the Berksfile to use stackforge

Also, updated spec tests to use new cookbook name 'openstack-dashboard'
and found 1 lingering 'horizon' attribute in dash-site template

Change-Id: I80d57c6f37583aec374f837c9b832576ac0e8b1b