Git commits in Moodle 2.5.5 by Tomasz Muras

commit 7b839b0ec1d3d7fdfe7f76066c49829936a2390e
Author: Tomasz Muras <tm@enovation.ie>
Date:   Mon, 03 Mar 2014 11:23:44 +0800
Tag:    v2.5.5

MDL-43656 mod_feedback: availablity date logic incorrect