added overclock feature
removed feature from driver
changed feature to set variable
Merge pull request #78 from schugabe/overclock

Added overclock feature
building hex for recent changes; including EMF avoidance.
Merge remote-tracking branch 'multiwii/master'

Conflicts:
	obj/baseflight.hex
	src/config.c
	src/drivers/system_common.c
	src/main.c
	src/mw.h
	src/serial_cli.c