Code review comment for lp:~alecu/ubuntuone-client/fix-nautilus-symlinks-udfs

To test this:

1) install the nautilus plugin from this branch
2) create a symlink in your home directory from a folder in your home directory
3) right click on both. The Ubuntu One pop-up menu should gray out the "Synchronize this folder" option only for the symlink
4) create a symlink in your Ubuntu One directory from a folder in your Ubuntu One directory
5) right click on both. The Ubuntu One pop-up menu should gray out the "Share..." option only for the symlink
6) create a symlink in your Ubuntu One directory from a file in your Ubuntu One directory
7) right click on both. The Ubuntu One pop-up menu should gray out the "Publish" option only for the symlink