A start at taking off using the z accelerometer data instead of a fixed
thrust curve. Very touchy, but clearly might do a better job.
Added support for gyro data as a telemetry block you can subscribe to.
You get x, y, z float data to do with as you please.

Right now it's just logged out verbosely.
Merge pull request #14 from ceejbot/flight-control-2

Flight control 2 - gyro data!