proper style for popover

  * new file popover.less
  * added to main file

Squashed commit of the following:

commit 2a2977e04d369e49ba085b143c7f2ac89a6af2ca
Author: Marthis <marthitaglam@gmail.com>
Date:   Mon Dec 16 14:57:48 2013 -0600

    Popover style

    New css file added