[ci] start memcached service in travis

They announced it early, but I forgot about
http://about.travis-ci.org/blog/2013-11-18-upcoming-build-environment-updates/
[webui] fix double render
[dist] try to avoid a deadlock on systemd systems using obsstoragesetup configuring sshd
[webui] sort architectures by name
[webui] catch invalid packages in attribute/edit
[dist] update gem versions
[api] get rid of db_ prefix in project and package foreign keys
[dist] we don't need launchy and headless anymore