Add BNO055 driver

[marcuswu]

The BNO055 from Adafruit (https://learn.adafruit.com/adafruit-bno055-absolute-orientation-sensor) is interesting as an IMU because it handles determining absolute orientation itself. I would like to use Go for my project so I'll need support for this sensor.

I am creating this issue to mark my intent to write a driver for it and to ensure there is no duplication of effort.