Got calibration working.  Reads out registers correctly, note this device uses litle-endian vs. big-endian.
=working read
Merge remote-tracking branch 'Rasp_Pi_work/master'
5495f7fe20082759e6d7e06528f912589.

Conflicts:
	Adafruit_BMP/BMP280.py
Commit of working version from backup.