Git commits in Moodle 2.9.1 by Simey Lameze

commit 1fab00298d37cc2267adbebf82f6b190e04c0869
Author: Simey Lameze <simey@moodle.com>
Date:   Thu, 28 May 2015 11:39:23 +0800
Tag:    v2.9.1

MDL-50380 mod_wiki: fix missing parameter on wiki edit files page

commit f0074472947a4cf50626a229e84da99187ebaff5
Author: Simey Lameze <simey@moodle.com>
Date:   Wed, 13 May 2015 13:51:22 +0800
Tag:    v2.9.1

MDL-49906 core_user: add require login exception message

commit a23669936799d3b42c63707fdd9933fbb1d54bcf
Author: Simey Lameze <simey@moodle.com>
Date:   Wed, 29 Apr 2015 10:52:49 +0800
Tag:    v2.9.1

MDL-25138 core_tag: fix correlated tags query unique error