add share buttons
fix double twitter widget
new post by Michal Kosmulski, to be published 2014-10-08
## Introduction
Merge pull request #11 in PROMOIT/opensource from PROMOIT-8_social_media_share to master

* commit '193f1f9c2ad53be7e456a54ec1af738cf7e3e602':
  fix double twitter widget
  add share buttons
Merge pull request #12 in PROMOIT/opensource from post-the-memory-game to master

* commit '122127664955109e5a412e7dd5b379570f7cc1a3':
  ## Introduction
  new post by Michal Kosmulski, to be published 2014-10-08