ButtonLed -- work on all processors

[dpharris]

I am not sure ButtonLed will work on all processors because it uses:
pinMode(pin, INPUT); // .. change the pin to input..
digitalWrite(pin, HIGH); // .. and activate pull up
and not all processor activate pull-up this way.

[dpharris]

Looks like newer IDEs, see: https://www.arduino.cc/en/Tutorial/DigitalPins
use:
pinMode(pin, INPUT_PULLUP);
and at keast Energia and Teensy allow:
pinMode(pin, INPUT_PULLDOWN);

Use code:
if(sense) pinMode(pin, INPUT_PULLDOWN);
else pinMode(pin, INPUT_PULLUP);
instead of:
pinMode(pin, INPUT); // .. change the pin to input..
digitalWrite(pin, HIGH); // .. and activate pull up

BUT INPUT_PULLDOWN is NOT defined on all processors.