[ardrone] use gpio API instead of system call
[mission] add support of rotorcraft to the  mission control module
[invariant] invariant filter less verbose by default
no certificate check in update google maps version

closes #772
[rotorcraft] add speed sp to GUIDANCE_H_REF_INT message

closes #763
[rotorcraft] use roll/pitch RC deadbands in attitude mode
[rotorcraft] guidance_v: only limit throttle if RC ok

This fixes failsafe if no RC or joystick present.
Thanks to evandersman
[flight_plan] Flight plan for indoor optitrack system
[conf] ardrone optitrack tuning
[ground_segment] add a video synchronizer tool

A tool to replay a video of a flight in sync with the replay of the log.
Closes #770
[airframe] Added exapmle Bumblebee Lisa/M 2.0 frame as promissed on Hak5.
[airframe] [bumblebee] Added some more comments and modules one might want to use in the bumblebee example airframe file.
[navigation] precision route fix
Merge pull request #775 from EwoudSmeur/route_precision

[navigation] precision route fix
[papgets] add exponentiation operator to papgets
[nps fix] block and setting messages only pared for correct AC_ID in nps
[nps] whitespace and style fixes
[modules] imu_aspirin2: fix typo in include
[build] add SRC_MODULES to rotorcraft
[Lisa/M V2.1] [DFU] Added 1 BIT SQUARED

as valid vendor and match only product in udev rules.
closes #778