fix execute command
add defaults --name and --vm options in build-base commands
add commands for quick machine creation

production-katello: a machine with katello in production
devel-katello: a machine with katello for development
a-machine: a machine with kvizer integrations without katello installed
Merge branch 'master' of github.com:pitr-ch/kvizer

* 'master' of github.com:pitr-ch/kvizer: (3 commits)
  Only Fedora 18 supported
  ...