Something happened at OSHPark that I've not seen ever in the 6 years or so I've been using them. A QC failure notice (fab's fault). No big deal. They'll re-run the boards. But it will be delayed a bit longer. 

The example i/o schematic was changed slightly to reflect a configuration with far better low-end response.

Added the Makefile for linux support program, but the i2c abstraction isn't in place yet for the dependencies.