LogAnalyzer: Binary Logs may end with \xff
 - ignoreBadlines can be used to assume this is a proper EOF
LogAnalyzer: write \xff EOF assumption to stderr
LogAnalyzer - Improve Autotune Test
 - previously version could report failed autotune sessions as valid and
   valid sessions as failed
Copter: don't stop logging on disarm when LOG_WHEN_DISARMED is set
AHRS: add reset_gyro_drift method
Copter: reset ahrs gyro drift after gyro calibration
AP_GPS: Add agcCnt to UBX1 message
Frame_params: 3DR_X8+_RTF.param

Adding param file for 3DR X8+
GPS: use primary for Notification
GPS: init primary_instance to zero
AP_AHRS : Add reset of EKF gyro bias states
AP_NavEKF : Add public method to reset gyro bias states
Copter: fail to arm if gyro cal fails
Copter: re-enable CPU failsafe if arming fails
AP_NavEKF : add INIT_GYRO_BIAS_UNCERTAINTY definition
Copter: update AC3.2-rc14 ReleaseNotes
PX4: conditionally build auth command and libraries

this makes it possible to build with upstream master
PX4: add TESTS_MATHLIB_DISABLE define

this helps building with upstream master
PX4: fixed startup log msg location
autotest: added developer build support

this creates firmware builds for developers in the devbuild directory