LinGui: Add Ubuntu 13.04 (Raring Ringtail) to nightly builds
Remove Ubuntu 11.04 (Natty Narwhal) from nightlies.


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5411 b64f7644-9d1e-0410-96f1-a4d463321fa5