2013.2 (Havana)

Merge "Updated description of availability zones extension"

Complete api-site split from openstack-manuals.

Moved the files relavent to the new api-site repo into their own
repository with the requested directory structure. Also, update
.gitreview file to ensure pushes go to the correct upstream repo.

Cut final Essex branch

Fix link to Quantum API guide on www/api/index.html

Change-Id: Id7ebbd1d8762beebf10bf8da028a5c21624dd325