Finish most of the uart stuff.

I've decided to push this, even though I can't test it.
That worries me a little. Use it with caution.

Implement GPIO stuff, and a main executable to receive uart
data. Also make some modifications to Brian's stuff, to get it to
build correctly.

Finally, add some testing stuff. Feel free to disregard that.
I probably won't be using it until I get debian flashed onto
my BeagleBone Black.
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