One of the forks has a Makefile

When I Googled "DigiSpark Makefile" I found this blog post:
http://christopherpoole.github.io/developing-for-the-digispark-without-the-arduino-ide/

This looks reasonable, so I'd like to propose merging this into the mainline tree and/or discuss what else could be done to provide a non-Arduino IDE approach to building code for the DigiSpark.