RabbitVCS doesn't have right-click integration with the file manager
I got it to work using the ppa, not the official repos :
sudo add-apt-repository ppa:rabbitvcs/ppa
#don't forget
sudo apt-get update
sudo apt-get install rabbitvcs-nautilus3
... I don't know what's in the official repositories, but it doesn't work.
and you will need to re-read the nautilus config
ps auxw|grep nautilus
kill -HUP <processid>
or just log out and back in again.