Adding some bootstrap base styling

1. Adding `modal-title` class instead of just using `<h4>` tag, according bootstrap basic [modal structures](http://getbootstrap.com/javascript/#modals)
2. Adding `href="#"` for each anchor tag inside dropdown menu.
3. Adding `margin-left: -16px;` on [summernote.less line 254](https://github.com/feryardiant/summernote/blob/7f7053b64956b4d202f54129c682e8f2be223681/src/less/summernote.less#L254)
4. Adding `fade` class in modal window