Add createStorageBusMonitor API point.  

See AppliedEnergistics/Applied-Energistics-2#418

Method returns "some IMEMonitor" guaranteed to get special treatment by the storage bus.  Allows external inventories to be implemented outside of the AE2 codebase and still cooperate with the storage bus.
I wondered if I would get called on that.  I went with the prevailing doc level of the file and thought it might be intentional.