[imp] mail: display who likes a post

 - Task: https://www.odoo.com/web#id=8679&view_type=form&model=project.task&action=333&active_id=131
 - Pad: https://pad.odoo.com/p/r.VlbOhsbzhWbR4Cga
In fact, you are trying to bind a popover to an onhover event... that's the normal behavior of a tooltip, isn'it?
I'd suggest to combine your code with Bootstrap's standard tooltips (see http://getbootstrap.com/javascript/#tooltips vs http://getbootstrap.com/javascript/#popovers), so that we avoid to reinvent the wheel; btw this will also mitigate styling issues.