Git commits in Moodle 3.3.0 by Dani Palou

commit aa9059b965a98ddb29524bf3093fb044a0edc4db
Author: Dani Palou <dani@moodle.com>
Date:   Tue, 14 Feb 2017 17:28:33 +0800
Tag:    v3.3.0-beta

MDL-57962 forum: Allow creating new discussions with groupid -1

commit 16840c7126f2492cc0b0138f661cd19117119b54
Author: Dani Palou <dani@moodle.com>
Date:   Tue, 07 Feb 2017 21:07:51 +0800
Tag:    v3.3.0-beta

MDL-57890 ws: Return cmid in all get_by_courses WebServices

commit 21d9f020ae3ef5c7cbac5c2c4f955e163052ea70
Author: Dani Palou <dani@moodle.com>
Date:   Thu, 02 Feb 2017 16:26:26 +0800
Tag:    v3.3.0-beta

MDL-57844 message: Add some message WS to the Mobile service