[ENHANCEMENT] joystick api

[nieknooijens]

Hi there

wouldn't it be a great idea to include the joystick api from here:
www.imaginaryindustries.com/arduino/leoJoy/USBAPI.h
www.imaginaryindustries.com/arduino/leoJoy/HID.cpp
http://www.imaginaryindustries.com/blog/?p=80
in the default distribution so the leonardo and the DUE can interact like true joysticks?

[ffissore]

What about proposing some code in the form a pull request? That will make life easier for those that want to try the api and for those that want to test it and decide to include it or not

[facchinm]

Close with #1803