suggesting to add Redmine 2.2.3 as a supported version

2.2.3 should be fine (http://forum.redminebacklogs.net/RM-2-2-3-supported-tp4025578p4025580.html)
although I can't see Travis build for it -don't know if it's a blocker.

My IT support is only willing to use RM/RBL versions that are specified on the website, and I'd like them to upgrade to 2.2.3. 

Thanks for considering.