title: BootStrap3 keep the dropdown menu open after click on the item
body: <p>I'm using Bootstrap 3.0, with its excellent drop-down menu.</p>
  <p>If I click outside of the drop-down menu the menu will disappear, and that is ok.</p>
  <p>But when I click on a drop-down menu item, the menu disappears. I do not want this to happen, and there is no option to control the toggle behavior. I want the menu to remain open after clicking on one of the items, like the Facebook notification menu.</p>
  <p>I think I have to modify the Bootstrap source, which I don't really want to do. So before I touch the source, I want to know is there any good workaround? If not, how should I change the source for minimum impact on Bootstrap?</p>
  <p>Thank you for any ideas.</p>