Spreadsheet Updates...

I've found more Arduino-compatible boards ('328- and '32u4-based) to add to the spreadsheet... there are always more! Plus I need to add the new official Arduinos, so:

• Arduino Due
• Arduino Explora
• Adafruit Flora
• Freaduino Micro
• Olympia Arno

I have mixed feelings about Arduino hardware. Their official boards have diversified in odd directions, and non-official versions keep doing everything better. For instance, it's strange that with so much going on on a Leonardo board, there's still no 3.3V/5V switch or jumper.