Get the text for tooltip with $.data (not $.attr)

Created by: keriati

Hi!

At the moment you are getting the text for tooltip like this:

title = $e.attr('data-original-title')

The bad thing is, if i want to use the tooltip with a "created" element like:

$('<a/>').data('original-title', 'This is some text');

it won't work.

Maybe switch

.attr('data-original-title')

to

.data('original-title')

in https://github.com/twitter/bootstrap/blob/master/js/bootstrap-tooltip.js