GSM2 Click Interfacing.

@Alex: I've just created an issue for this: https://github.com/espruino/Espruino/issues/318

I'm not 100% sure when it will come - will you need to bind arguments, or just this?

If you don't need args, you can always workaround it for now by doing:

Function.prototype.bind = function(thisArg) {
  var f = this;
  return function() { return f.apply(thisArg, arguments); };
};