Git commits in Moodle 2.9.3 by Paul Nicholls

commit 3b9ba0034cc5a08d3b97b97e8723bd336ffd7c8d
Author: Paul Nicholls <paul.nicholls@canterbury.ac.nz>
Date:   Thu, 29 Oct 2015 04:29:16 +0800
Tag:    v2.9.3

MDL-51918 gradereport: Fix AJAX mode keyboard navigation


commit 4bb31de25230e3de5848338802924fdd51d7f82a
Author: Paul Nicholls <paul.nicholls@canterbury.ac.nz>
Date:   Thu, 22 Oct 2015 07:12:22 +0800
Tag:    v2.9.3

MDL-51854 atto_image: Allow other plugins to handle drop events


commit b5c0915c7842fd8030a8d676ed3ceba60b1c7542
Author: Paul Nicholls <paul.nicholls@canterbury.ac.nz>
Date:   Mon, 24 Aug 2015 11:46:44 +0800
Tag:    v2.9.3

MDL-51190 javascript: Make "maximised embed" compatible with MS Edge