Merge branch 'master' of https://git.ece.iastate.edu/danc/MicroCART_17-18

quad/src/quad_app/control_algorithm.c

quad/src/quad_app/controllers.h

quad/src/quad_app/hw_iface.h

quad/src/quad_app/initialize_components.c

quad/src/quad_app/log_data.c

quad/src/quad_app/quad_app.c

quad/src/quad_app/send_actuator_commands.c

quad/src/quad_app/send_actuator_commands.h

quad/src/quad_app/sensor.c

quad/src/quad_app/sensor_processing.c

quad/src/quad_app/sensor_processing.h

quad/src/quad_app/type_def.h

quad/src/quad_app/user_input.c

quad/src/quad_app/user_input.h

quad/src/quad_app/util.c

quad/src/quad_app/util.h

quad/src/virt_quad/hw_impl_unix.c

quad/src/virt_quad/hw_impl_unix.h

quad/src/virt_quad/hw_impl_unix_motor.c

quad/src/virt_quad/hw_impl_unix_rc_receiver.c