Merge pull request #25 from ares/master

Various fixes
Add restore command

Useful when you try something for several times and you have snapshot of
machine just before trying (e.g. manifest import)

kvizer restore -m <name>

It turns off machine, restores latest snapshot and boot it up again.
Really cool if your snapshot is of live machine.
Force poweroff of machine during restoration

Since we restore saved image we don't afraid of data corruption and
it's much faster just to kill it.
Merge branch 'master' of git://github.com/pitr-ch/kvizer

* 'master' of git://github.com/pitr-ch/kvizer: