Release 2017_015 (2017-07-06)

NixOS platform

• Provide yarn-0.20.3, to be installed via nix-env -iA nixos.yarn (#27599).

• Port XCache 3.2.0 to PHP 5.6 (#27595).

• Security update for ImageMagick (update to 6.9.8-10, #27180).

• Pre-build binaries to decrease installation times: pdftk (#27590), Java

• Re-enable logging in the graylog configuration tool (regression fix, #27683).

• Add a basic coturn service definition (#26679).