varnish http caching conference message queues symfony meetup php architecture libraries web performance rest server client debugging routing https rokka rabbitmq mysql doctrine bash workshop ez elasticsearch german httplug training tutorial cmf french staging configuration apache tools phpstorm phpcr jackalope assetic javascript create.js agile ws2801 electronic art arduino photos dic content repository testing processing.org interactive art images content management script boardgames lucene google search appliance drupal wallis fun recycling semantic mediawiki i18n versioning regexp email sso shell linux verinec opensource make latex xml java