updated for python 3.6 and added noop

This version updates the library to work with Python 3.6 (the most recent version as of this date), and adds the noop command.

Macs continue to be problematic in the sense that they drop the bluetooth connection very quickly, and the library has to compensate behind the scenes to restore that connection. This release adds a noop command and a noopWait to continue to send packets to keep the connection alive.