New general layout using <div>s

Another rebase of https://github.com/jenkinsci/jenkins/pull/1298
For users that are logged in, don't have job create permission, and cannot see any jobs, this will show an empty block with line at the left: https://www.dropbox.com/s/3hbw5c0pp0oleis/Screenshot%202014-07-12%2015.59.00.png