~xdavidwu/motion-control

sensors::L3G4200D: enable high-pass filter @0.05hz

this helps with fighting nearly-constant drift
ahrs: complementary: ignore yaw from tilt
math::quaternion: add from_euler
add controlling client for gy-801
add pointer controlling over udp
add README
math::quaternion: remove early test leftovers
ahrs: tilt: guard against acos(>1), acos(<-1)
ahrs: implement complementary filter
ahrs: tilt: fix direction
ahrs: implement tilt
gy-801-dump: bump gyro read rate
gy-801-dump: perform quaternion forward integration
gy-801-dump: continuous measuring
sensors::L3G4200D: read byte by byte

the chip i have seems to response to smbus read word in wrong order
gy-801-dump: read L3G4200D
sensors: add L3G4200D
i2c::smbus: implement completely in hare

the c library is actually pretty simple to port
this remove the need to link with c library
tools: add gy-801-dump
sensors: add ADXL345
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