New animation proposal: headShake

[FelipeMartinin]

Hello

I've created an animation called "headShake", amazing for natural negative feedbacks

check out the preview:
http://codepen.io/FelipeMartinin/pen/ZbOvxr

Pull request link: #465

How about merge it? :D

[alasdairmackenzie]

👍

[tnga]

Nice! 👍

[jnovack]

Github REALLY needs a Like and vote counters. I HATE commenting to say that I like something and show support. "+1" just clogs comment areas and hinders discussions. :/

On that note, I love it. +1.