$().unbind('.namespace') added

You can now unbind all namespaced events in one easy call. This is
very useful for cleanup in plugin development.
Example:
$('#foo').bind('click.bar', function() { ... });
$('#foo').bind('mousedown.bar', function() { ... });
$('#foo').bind('mouseover.bar', function() { ... });
// #foo now has three bound events
$('#foo').unbind('.bar');
// #foo now has no bound events