card.io-dmz | core image-processing and machine-learning code

The dmz code contains many helpful comments, and variable and function names are usually meaningful, but otherwise we have not prepared much in the way of documentation. A very informative resource is this talk that Josh Bleecher Snyder gave in 2015. He provides a fairly detailed overview of the steps followed by the card.io pipeline, and the thinking behind them. There are also some useful documents in the docs folder.