Git commits in Moodle 3.1.0 by liorgi

commit db3a6216cc287aac07499e656a1493fe3982e6c8
Author: liorgi <liorgi@openu.ac.il>
Date:   Sun, 10 Apr 2016 15:35:56 +0800
Tag:    v3.1.0-beta

MDL-48089 mod_forum: Improve DB query in observer

commit 73dcd8282a735f73cd1c1b5f129a5a0161709747
Author: liorgi <liorgi@openu.ac.il>
Date:   Sun, 10 Apr 2016 13:51:57 +0800
Tag:    v3.1.0-beta

MDL-53702 mod_forum: Remove unused variables

commit 7664fe2efb722058accb1edf6866802109055ef1
Author: liorgi <liorgi@openu.ac.il>
Date:   Thu, 07 Apr 2016 22:34:18 +0800
Tag:    v3.1.0-beta

MDL-53702 mod_forum: Remove unused variables