Supports Arduino Leonardo on Windows

[modlfo]

This change gives support for Arduino Leonardo on Windows

[soundanalogous]

Did you test to ensure it doesn't break support for other boards?

[modlfo]

I borrowed a few boards to test. It works on Arduino Leonardo, Arduino Uno, Teensy 3.1. But did not worked on Arduino Mega 2560 and ChipiKit Uno.

I guess that hard-coding my change is not the best solution.