[conf] Airframe Templates: $AC_ID is auto-filled. Allows to include specific calibrations and set specific names.
[conf] fix ardrone2_sdk: all leds default to none
[conf][subsystems] x_LED default to none so it doesn't fail if not defined in board makefile
Merge pull request #533 from dewagter/master

[conf] Airframe Templates: $AC_ID is auto-filled.