This is a port of the RampingIOS firmware from Tom_E and ToyKeeper.
See: http://bazaar.launchpad.net/~toykeeper/flashlight-firmware/trunk/view/head:/Tom_E/RampingIOS/

Differences:
* Moved much of the MCU-specific code into tk-attiny.h
* Added compatibility with the new TinyAVR Series-1 (or Series-0) chips
   such as attiny412, attiny416, and attiny817
* Added single-channel option