Merge pull request #17 from pronix/master

fix issue with run_provisioner
Exception handling while starting a domain.
Merge pull request #20 from pronix/master

close issue #15 for download box automaticaly
Merge pull request #21 from pronix/master

close issue #13 for exec cli
v0.0.4
Merge pull request #22 from pronix/master

nested virtualization (VMX)
* Private network support.
* Creating private networks if ip address is set and network
  is not available.
* Guest network interfaces configuration.