fix boot trigger of relay

[gouldner]

I fixed the issue I was reporting ( #35 ) and wanted to share my solution.

I found that the call to GPIO.setup(self.relay_pin, GPIO.OUT) starts with the GPIO sending the signal to the relay and turns off a few lines down when GPIO.output(self.relay_pin, self.invert_relay) is called.

So I moved GPIO.output(self.relay_pin, self.invert_relay) right after the setup and the trigger no longer happens.

[alastaid]

Hi, I had the same issue and this fixed it, thanks for posting.

[craigInTx]

There is still a moment (although more brief now) that the output would be toggled.
better solution: change:
GPIO.setup(self.relay_pin, GPIO.OUT)
to:
GPIO.setup(self.relay_pin, GPIO.OUT, initial=self.invert_relay)
to properly set the initial state on output setup.

I created a new pull request with this change.