Fixed Issues 21 and 22 . The prior version did not release EPD SRAM CS_pin between updates. As a result, sharing the SPI lines with another device would cause miscommunication. Also, within the EPD board, there was miscommunication which caused the fill logic to fail. Both problem were fixed with this change.
To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle).
To use in CPython, `pip install adafruit-circuitpython-epd`.
Read the [docs](http://circuitpython.readthedocs.io/projects/epd/en/latest/) for info on how to use it.
* Note, this is 2.03 re-released as 2.4.0 to fit proper semver.