minor code cleanup
renamed struct from vm to vbox
added support for retrieving information on vm
added information display
added support for configuration of cpu and memory
added support for setup of boot order
added support for handling nics
changed clone ui: template must always be given
show mac of nics
fixed bug with waiting for guest properties
added support for sharing folders
improved handling of VM configuration
improved shared folder implementation
use ubuntu as default user for login
fixed bug with configuration of nics
changed the ui a lot
use fmt.Printf to write to stdout