Namespaced events cause memory leaks

[scott.gonzalez]

$('<div></div>').bind('click.foo', function() {});

leaks memory in IE (tested using Drip).

$('<div></div>').bind('click', function() {});

works fine.

[brandon]

I had a really difficult time getting a reliable test case to verify this actually solves the memory leak. r6321 appears to have fixed this issue.