Added ability to bind multiple swipe events

I wrote this up as issue #31 earlier today.  Here is my attempt.  I don't claim it is especially elegant, but it works.

You can bind multiple event handlers using the same calling convention as binding one:

    $obj.swipe({swipe: myhandler1});
    $obj.swipe({swipe: myhandler2});

Both will be called.  I went ahead and implemented this for all the events swipe, swipeLeft, swipeRight, swipeUp, swipeDown, swipeStatus, and click.  Only tested it for swipe, though.