[fix] typo in githelper script

close #710
[ardrone] Slow-Down Heading rate
[energy_ctrl] Energy loops not being called. Code commenting.
[airframe] Default Energy Gains Simulator
[rotorcraft] remove unused RC_LOST_MODE from autopilot.c

RC_LOST_MODE is correctly defined and used in main.c
[conf] stm32 upload: fix DFU_SIZE on OSX
[datalink] w5100: rename too generic rx_buf var