Performance improvement
https://github.com/victor-valencia/bootstrap-iconpicker/blob/master/bootstrap-iconpicker/js/bootstrap-iconpicker.js#L510

I have 20-30 icon pickers on page.

And in my case I see in profiler that when I click on body this handler take 50-60ms.

It is possible to reduce this time to 2-3ms if we will just not run $(this).popover('destroy'); for each iconpicker, and will run it only for icon picker that is opened.
