Git commits in Moodle 3.3.4 by Zig Tan

commit 13c3219692f641151c1badf758c62b8362171c49
Author: Zig Tan <zig@moodle.com>
Date:   Tue, 02 Jan 2018 13:10:37 +0800
Tag:    v3.3.4

MDL-57786 mod_assign: Fix word count for online text submissions

commit 39dc526cd499e9b5746a0a854fca3f57c0a7318e
Author: Zig Tan <zig@moodle.com>
Date:   Fri, 22 Dec 2017 13:03:08 +0800
Tag:    v3.3.4

MDL-33886 backup: Add backup filename length < 255 char validation

commit 6acae651b3dedb48eab3a5be58311a4cbadc06a6
Author: Zig Tan <zig@moodle.com>
Date:   Fri, 15 Dec 2017 09:19:26 +0800
Tag:    v3.3.4

MDL-54967 backup: Fix IMS CC import URL decoding for XML format

commit 63d3298c0b23bd639cc69b7976aa22861b472bd4
Author: Zig Tan <zig@moodle.com>
Date:   Tue, 12 Dec 2017 09:01:23 +0800
Tag:    v3.3.4

MDL-42676 mod_assign: Display message fix when using grade override