Improvements

[Iceburgino]

1. Change events from add and remove to bind and unbind - the never ones that happen a little bit later than add and sooner than remove, so that the device can be properly initialized.

2. Add default behavior, if no vm domain is specified. In this case, the script will pick the longest-running vm.

3. Add monitor script, that allows for finding ports quickly. The author is darkguy2008. I modified it a bit, so that it searches for what's necessary only.

4. Add hotplug-setup script that copies usb-libvirt-hotplug to bin directory, finds usb ports and adds udev rules automatically.