KICKR ANT+ Initial Support

.. the code has been updated to support the Wahoo Kickr
   via an ANT+ USB stick.

.. this requires the Kickr to be running a beta firmware
   of version v1.3.15. This can only be loaded via the
   Wahoo utility.

.. for those that have access to the beta firmware this
   patch will work, for all others they will need to wait
   for the formal release by Wahoo.

.. the code contains *lots* of debug and does not yet support
   calibration and slope mode is largely untested.