Add missing release name/id to XML and JSON output of issues controller

platform:  # supported: 2.2.4, 2.3.0
backlogs:  # supported: 0.9.38
ruby:  # supported: 1.9.3, 2.0.0

See http://forum.redminebacklogs.net/Release-field-not-showing-up-in-XML-td4025721.html