tessel/ambient-attx4 — pull request #35 by johnnyman727 (2014-08-02 00:49:14+00:00)
Title: Jon auto update

* Refactors USI SPI Driver and shared attiny functionalities into submodules
* Updates Makefile for the submodules
* Integrates with the `attiny-common` submodule which should:
* Make sure the right module is being plugged in (IR vs. Ambient)
* Upload new firmware if old firmware is detected
* Upload new firmware if the firmware version can't be read