Fixes

Hi Fábio,

vagrant-lxc is a great work, well done!

I've tried out vagrant-lxc on ubuntu 13.10 with ubuntu lxc ppa's.
vagrant status has shown the containers in unknown state, hence the first fix.
The other one was a very long waiting time for vagrant destroy.
I inserted a line to first shut down the container and then stop it.

Best regards,
  Attila