v0.1.1: Workaround for not having an any() method

Reduced the timeout value for the UART bus from 1 second to 30
milliseconds. This makes the library almost as fast as the version that
had access to the UART.any() method.

Also, lots of updates to the documentation.

Removed dummy files

The dummy files machine.py and utime.py aren't necessary when you properly use Sphinx's mock imports feature.

First release for CircuitPython

Followed Adafruit's guide to packaging drivers.