[add] inlcude bower to the project for libs and dependency management
[mod] include SimplePie via Bower
[mod] include PEAR core and Cache_Lite via Bower
[rem] remove json_decode replacement by Zend, add error message to use correct PHP version
[mod] include PHP-Gettext lib via Bower
[mod] include PHP OAuth library via Bower
[mod] rename SimplePie vendor directory
[mod] include Mustache.php via Bower
[mod] ignore app/vendor folder