Add pure-CSS tooltips

[tonystar]

https://github.com/eliorshalev/tootik
https://github.com/chinchang/hint.css
http://www.w3schools.com/css/css_tooltip.asp
https://github.com/kazzkiq/balloon.css
https://github.com/picnicss/picnic/tree/master/src/plugins/tooltip
https://github.com/arashmanteghi/simptip/

And as an example to "Pure CSS" label.

[Adijav]

hi @tonystar isn't this already there in bootstrap http://getbootstrap.com/javascript/#tooltips.
Or I am understanding the requirement wrong?

[tonystar]

@Adijav you are right! In this issue I would like to add some descriptive tooltips to demos. Of course I will use Bootstrap built-in tooltips!

[tonystar]

@Adijav or even better I would like to integrate pure-CSS tooltips!