transferred search form from all articles to header navigation and styled it with an own less file
styled header navigation
exclude style-min.css via gitignore
fixed rss-feed in functions.php and cleaned up code
added compatibility for Facebook and Google+ via Open Graph Protocol (http://mizine.de/html/open-graph-meta-informationen-in-wordpress-beitrage-einfugen/)
added compatibility for Facebook and Google+ via Open Graph Protocol (http://mizine.de/html/open-graph-meta-informationen-in-wordpress-beitrage-einfugen/ und http://www.hongkiat.com/blog/facebook-open-graph-wordpress/)