Add microduino variant as copy of maple_mini
microduino: assign correct port values to GPIO pins
microduino: Add OS X version of maple_upload script

Currently this is a wrapper around dfu-util; tested with
dfu-util-0.7.mpkg, e.g.
https://code.google.com/p/companion9x/downloads/detail?name=dfu-util-0.7.mpkg
Merge branch 'master' of https://github.com/IanHarvey/Arduino_STM32