attitude_estimator_ekf: auto detect mag declination using GPS coordinates
Merge branch 'master' into ekf_auto_mag_decl
mavlink app: Clean up allocations
Converted streams to new API, saving a bunch of RAM
mavlink app: Fix compile error
mavlink app: Finish porting all messages to new scheme
Merge branch 'master' into ekf_auto_mag_decl
Merge branch 'master' into mavlink_stack
MavlinkOrbSubscription API reworked
Merge branch 'master' into mavlink_stack
mavlink: sign of climb rate fixed in VFR_HUD message
Merge pull request #969 from PX4/mavlink_stack

Mavlink stack usage improvements
Merge pull request #928 from PX4/ekf_auto_mag_decl

attitude_estimator_ekf: auto detect mag declination using GPS