php symfony testing conference frontend meetup french database postgres GIS linux mysql json electronic art arduino ws2801 interactive art 3d printing doctrine architecture web performance varnish http caching message queues libraries german rest server client debugging routing https rokka rabbitmq bash workshop ez article elasticsearch httplug training tutorial cmf staging configuration apache tools phpstorm phpcr jackalope assetic javascript create.js agile photos dic content repository processing.org images content management script boardgames lucene google search appliance drupal fun recycling semantic mediawiki i18n versioning regexp email sso shell verinec opensource make latex xml java