SAN FRANCISCO--(BUSINESS WIRE)--Docker, the organization behind the open platform for distributed applications, has announced its second official DockerCon conference in Europe and a call for speakers for its conference tracks. DockerCon Europe 2015 is a two-day Docker-centric conference designed to provide attendees with information about all the interesting ways developers, Ops, DevOps and Sysadmins are using Docker. The conference will take place in Barcelona, at the Barcelona International