o Move actions (operate relays) into GPIOActions and make DoorActions
  an interface.
Merge branch 'master' of github.com:hzeller/rfid-access-control

Conflicts:
	software/earl/accesshandler.go
	software/earl/main.go
Merge branch 'master' of github.com:hzeller/rfid-access-control

Conflicts:
	software/earl/authenticator.go