Cinnamon target

**Calling for Cinnamon testers!** I'd like to get some feedback on as many platforms/distros/releases as possible to iron out any kinks.


Some notes:
* Ubuntu users on i386/amd64 get a fancy PPA with Cinnamon 1.8 for precise, quantal, raring, and saucy. Sweet!
* Cinnamon should work on ARM, but has to use the distro packages because there are no PPAs. Which means you have to be using raring or later, or Debian testing/unstable.
* There are a few minor things that I know don't work, and probably will not be fixed (default background on precise is just the color blue...) but most other major things should be working. If they're not, please let me know!
* Cinnamon on Debian sid is currently broken; it should be patched soon. See http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=718573
* Older discussion: issue #220 :shipit: