Merge pull request #156 from jgoppert/sensor_hil_rebase

.gitignore

apps/commander/state_machine_helper.c

apps/examples/control_demo/control_demo.cpp

apps/examples/control_demo/params.c

apps/examples/kalman_demo/KalmanNav.cpp

apps/examples/kalman_demo/KalmanNav.hpp

apps/examples/kalman_demo/params.c

apps/mathlib/math/Dcm.cpp

apps/mathlib/math/Dcm.hpp

apps/mathlib/math/EulerAngles.cpp

apps/mathlib/math/Quaternion.cpp

apps/mathlib/math/nasa_rotation_def.pdf

apps/mathlib/math/test_math.sce

apps/mavlink/mavlink.c

apps/mavlink/mavlink_hil.h

apps/mavlink/mavlink_receiver.c