[TIMOB-824] Parent events fired when child view has same event callback

Sample code:

var w = Ti.UI.createWindow();

var v1 = Ti.UI.createView({
    top:10,
    left:10,
    right:10,
    bottom:10,
    backgroundColor:'#ff0000'
});

v1.addEventListener('touchstart', function() {
    Ti.API.info('Touched view 1');
});

var v2 = Ti.UI.createView({
    top:50,
    left:50,
    right:50,
    bottom:50,
    backgroundColor:'#00ff00'
});

v2.addEventListener('touchstart', function() {
    Ti.API.info('Touched view 2');
});

v1.add(v2);
w.add(v1);

w.open();

Click in the second view and you'll see both the events for v1 and v2 are fired. This may cause problems in some situations; maybe add a 'propagatesEvents' flag?