Git commits in Moodle 3.2.8 by David Mudrák

commit b117c4e23f7dc0aaba03852349c9cafd7493b6dc
Author: David Mudrák <david@moodle.com>
Date:   Thu, 15 Feb 2018 19:50:46 +0800
Tag:    v3.2.8

MDL-61392 enrol_paypal: Improve IPN input parameters checking

commit c19d2c324bb8f6de2c1f80e9d7d8a4b07ce3464c
Author: David Mudrák <david@moodle.com>
Date:   Thu, 15 Feb 2018 17:28:31 +0800
Tag:    v3.2.8

MDL-61392 enrol_paypal: Improve the IPN notifications handling

commit 749bdfe00dc095ae8f7915fd234b5f208b6eac37
Author: David Mudrák <david@moodle.com>
Date:   Thu, 01 Feb 2018 06:05:22 +0800
Tag:    v3.2.8

MDL-61242 repository_equella: Fix missing class repository