Merge tag '0.7' into nightly

0.7
wait for the vm to be powered off before removing it

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>
check the vm is not yet powered off before trying to power it off

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>
added more versions to travis testing

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>
version bump to 0.8

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>
Merge branch 'release/0.8'