Git commits in Moodle 2.8.3 by Ankit Agarwal

commit 64a15b04b1ef35f59f1384f9146ddca4790b5c54
Author: Ankit Agarwal <ankit@moodle.com>
Date:   Thu, 25 Dec 2014 16:26:19 +0800
Tag:    v2.8.3

MDL-48510 inbound: use 0 expiration for private files handler

commit 8293f6c86fc66cbaf2a3fe44d7e54f1b08d72152
Author: Ankit Agarwal <ankit@moodle.com>
Date:   Thu, 25 Dec 2014 14:17:19 +0800
Tag:    v2.8.3

MDL-48510 inbound: Support disabling of expiration changes in UI

commit 5a8291753aec434767b2ea012cc6059d7556a68d
Author: Ankit Agarwal <ankit@moodle.com>
Date:   Thu, 25 Dec 2014 14:16:43 +0800
Tag:    v2.8.3

MDL-48510 inbound: Use correct value of expiration