Created by: joprice
Reordered access of options in tooltip and popover to allow overriding data attrs from js.
The current functionality gives higher precedence to the html, so that a call like
$('#pop').popover({content:'overriding content'})does not override the html attribute 'data-content' in
<div id="pop" class="btn" data-content="content" rel="popover">Button</div>