Git commits in Moodle 3.1.2 by Juan Leyva

commit ab793a088dda8f4fecc574d6ca7429fda0747109
Author: Juan Leyva <juanleyvadelgado@gmail.com>
Date:   Thu, 14 Jul 2016 16:10:07 +0800
Tag:    v3.1.2

MDL-55220 forum: Add string filtering in WS

commit 468de0256580cc668d75a5ba66a76df5e2e46c1e
Author: Juan Leyva <juanleyvadelgado@gmail.com>
Date:   Mon, 11 Jul 2016 19:06:40 +0800
Tag:    v3.1.2

MDL-49026 webservice: Remove tokens on password change

commit 9eb1e017e12c665552579301395b81f36ab166ba
Author: Juan Leyva <juanleyvadelgado@gmail.com>
Date:   Fri, 08 Jul 2016 20:29:39 +0800
Tag:    v3.1.2

MDL-55163 mod_assign: Fix mod_assign_copy_previous_attempts

commit 9b7d5cd41bfc701704d2d951e001c2eeadb8e4a9
Author: Juan Leyva <juanleyvadelgado@gmail.com>
Date:   Tue, 05 Jul 2016 16:50:32 +0800
Tag:    v3.1.2

MDL-55128 course: Fix param type for shortname