FTC HQ sync, AdaFruit IMU completion

This release synchronizes with the update from FTC HQ published on Sept 18, 2015. It also includes a number of improvements of our own, notably what appears to be a fully functional AdaFruit IMU (this time for sure!).

There are small breaking changes in IBNO055, caused by the movement of Position, Velocity, etc to top level classes. I2cDeviceClient has several new features, which also causes some breakage.