Collapse.prototype.show find selector

Created by: FarSeeing

Right now Collapse.prototype.show uses the following jQuery selector:

this.$parent.find('> .panel').children('.in, .collapsing')

https://github.com/twbs/bootstrap/blob/master/js/collapse.js#L49

The .find('> .panel') will always be processed by Sizzle and not by querySelectorAll because of the child selector (>). Would be nice to replace with .children('.panel').children('.in, .collapsing').