Git commits in Moodle 3.5.x by vinhle

commit 23628a98fcd36afa5ae54714f4b5e6495724a6db
Author: vinhle <lethevinh.qng@gmail.com>
Date:   Thu, 14 Jun 2018 11:21:42 +0800
Tag:    v3.5.2

MDL-62037 Filepicker: Review image not change when overwrite same


commit 8e0bebd1cd4e6ac87d224b64ff9c4a7c5e65a74b
Author: vinhle <lethevinh.qng@gmail.com>
Date:   Mon, 23 Apr 2018 15:52:26 +0800
Tag:    v3.5.0-rc1

MDL-61715 question: qbank_chooser is not intelligent about headings