Disable gdm. It's runtime files are needed for gnome shell wayland, but now it seems it was RUNNING! (Probably due to Ubuntu 14.10 gaining systemd support too it now has the files)

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2901 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9
Ubuntu upstream packages now have systemd files, so I no longer need them in the SVN

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2902 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9