sensors: support for Futaba RC failsafe
commander: bug fixed in failsafe
sensors: code style fixed
multirotor_att_control: use PID lib for yaw rate control
multirotor_att_control: style fixes, cleanup
Merge branch 'master' into rc_failsafe
Startup scripts: Corrected cases where commander was not started, updated several outdated scripts
Startup scripts: Start the commander early and let it try to open the mavlink_fd with 20Hz
Merge pull request #515 from julianoes/startup_fixes

Startup script update
remove commander from hil startup scripts
Merge pull request #517 from thomasgubler/hil_startupscripts

remove commander from hil startup scripts
Startup scripts: fixed stupid typo
Merge pull request #518 from PX4/hotfix_fixedwing_startup

Startup scripts: fixed stupid typo
Battery current reading implemented.
Workaround to compile on FMUv1.
Hotfix: Be more aggressive about SPI2 init on v1 boards
sensors: fixed bug discharged battery current
sdlog2: log all low-level battery parameters in BATT message
Use discharged current to estimate remaining battery charge if capacity is known
multirotor_pos_control: failsafe against invalid yaw setpoint in AUTO