Phillip Stevens - 2015-04-25

Added support for USB Host using the MAX3421E found on Seeed ADK board, and on Circuits at Home Shields (and other places). This is based on the microbridge project, and the code is in the folder of that name. Lots of updates from the most recent Circuits at Home repositories.

The ADB code is not well tested as my Android devices all required encrypted ADB, which this implementation doesn't support.

The HID code works well with mice and keyboards. That's all I built.