Add pinterest button and reorganize social sharing

First step in better social experience
I created one template for each social media (facebook, twitter, g+ and pinterest)
Also social media are only displayed when information is available

Finally, I corrected the facebook template which was using some unknown app_id...... that is user specific and needs to be set per user!
Align the parameters of a method call if they span more than one line.<br>Missing space after #.