Allow set breakpoint inside FreeRTOS code

	fix path separator on windows platform (FreeRTOS//Sources)
	modified:   make/common-defs.mk
Fix warnints in attitude module.
	modified:   flight/modules/Attitude/revolution/attitude.c
	modified:   flight/modules/Sensors/sensors.c
	modified:   flight/pios/common/pios_l3g4200d.c