Use IRQ as pin

[federicobriata]

This patch it's needed in order to set INT1 instead INT0 without need to hardcode it when we are on Leonardo and Yun.
This patch has been tested with this sketch, https://github.com/federicobriata/OpenGarden

[JohnOH]

I think this change has a few issues. It changes all devices to use INT1 e.g. lines 297 & 309.
If this is needed in the Master branch I suggest that the choice of INT0 or INT1 is made selectable with a new varible in each device section which is then used in lines 297 & 309 etc.
Probably also needs a seperate selection area for Yun to avoid conflict with existing ATMEGA32 usage.

[JohnOH]

Hi Martino, I hope I am not missing something and I am pleased that jeelib has exposure in Itally. However I have concerns with your change for existing users of the library using Leonardo hardware already hardware configured for INT1. Changing the library will trigger problems for them when they next compile.

I don't currently see how to combine your wishes with the need to protect the status quo for exiting coders.

[federicobriata]

Hi John, this is Federico the author of this pull request and of the second commit, nice to meet you. I agree with your concern, this new change shall solve the problem.
I believe there was a misunderstanding: there is no direct involvement between Arduino with jeelab, I just meet Martino some years ago in fablab Torino in spare time (as we live in the same city) and helped me to use a shield I have.