SPI mode for module HD44780

Hi!

You should be able to do:

var HD44780 = require("HD44780").HD44780;

connectSPI = function(spi, cs) {
  return new HD44780(function(x, c) {
    // ...
  });
};

That'll work even without touching the module - but if you get something working it'd be great if you could contribute your code so I can stick it in the main one :)