Zepto fast buttons without nasty ghostclicks.
Supports event delegation and handlers removal.
Highly inspired by http://code.google.com/mobile/articles/fast_buttons.html
    
Usage:
    
bind:
$('#someid').onpress(function(event){});
$('#someid').offpress(function(event){});
    
delegation:
$('#someid').onpress('.childNode', function(event){});
$('#someid').offpress('.childNode', function(event){});
    
Word of advice:
Never ever try to attach this event handlers to: document, html, body.
All sorts of weirdness going to happen. Use onclick instead.