Merge remote-tracking branch 'origin/master' (dak23) into development

Conflicts:
	AeroQuad/AeroQuad.ino
	AeroQuad/FlightControlProcessor.h
	AeroQuad/SerialCom.h
	AeroQuad/UserConfiguration.h
	Libraries/AQ_BarometricSensor/Examples/Test_BMP085/Test_BMP085.ino
	Libraries/AQ_Gyroscope/Gyroscope_L3G4200D.h
heading improvement!
some altitude hold test!
Update user configuration for devel branch.
Update L3G4200D driver for devel branch.
Update HoTT telemetry for devel branch.
Merge branch 'development' of https://github.com/AeroQuad/AeroQuad into development
Cleanup L3G4200 gyro driver.
Use calibration values instead of hardcoded ones (works a hell lot better) … for LSM303DLM.
Switch to gyro sum measurement.
Add support for Serial2
New configuration after changing board to Seeduino Mega.
Axis inversion for Accelerometer.
Merge branch 'development' of https://github.com/AeroQuad/AeroQuad into development

Conflicts:
	AeroQuad/AeroQuad.ino
	AeroQuad/SerialCom.h
	AeroQuad/UserConfiguration.h
Make Gyroscope calibration less sensitive - otherwise it never completes. Reinsert Graupner telemetry.
Add GPS data transmission for HoTTv4.
Really support Serial2.
Remove flush statements to not wait until byte is completely spend (took around 0.4ms each call) and revise timing.
Remove debug statements.
Update user configuration.
Support LED stripes.
Merge branch 'development'

Conflicts:
	AeroQuad/AeroQuad.ino
	AeroQuad/UserConfiguration.h
	Libraries/AQ_BarometricSensor/Examples/Test_BMP085/Test_BMP085.ino
	Libraries/AQ_Gyroscope/Gyroscope_L3G4200D.h