Added announcement list and infinite scroll

Added createdAt field to Announcement entity

Added truncated description in announcement list

Fix CS

Added functional test for announcement list with fixtures

Add casperjs announcement list and infinite scroll tests

Added test for ajax call in announcement list

Some fixes

Fixed minor issues

Moved twig.extension.text definition
Added announcement list filtering functionality

Added twig extension to convert country code

Added app_test.php and added more casperjs tests