Developer credits

Git commits in Moodle 2.1.5 by Dan Poltawski

commit 4e012c2700e6f10855bb7c27164613d8d4940884
Author: Dan Poltawski <dan@moodle.com>
Date:   Sun, 26 Feb 2012 18:39:40 +0800
Tag:    v2.1.5

MDL-29592 weblib: prevent warnings when $USER not set

commit e3c04a7426b877cb8ac067b98695f49a28541cab
Author: Dan Poltawski <dan@moodle.com>
Date:   Fri, 24 Feb 2012 11:54:43 +0800
Tag:    v2.1.5

MDL-29199 dml: fix query logging on Oracle

commit c3eb0eec2a3c5ab8a9b37000ac4d273fcc5d600b
Author: Dan Poltawski <dan@moodle.com>
Date:   Fri, 24 Feb 2012 11:39:56 +0800
Tag:    v2.1.5

MDL-31546 wiki: remove stray semicolon

commit ff0e0c099e2baee46615e7e08eb15ce7274c503b
Author: Dan Poltawski <dan@moodle.com>
Date:   Thu, 23 Feb 2012 15:52:21 +0800
Tag:    v2.1.5

MDL-31651 course/info: Fix hardcoded string

commit 145d39a35a306bb9fb0a52938630a1f2a65859a4
Author: Dan Poltawski <dan@moodle.com>
Date:   Thu, 23 Feb 2012 14:55:30 +0800
Tag:    v2.1.5

MDL-31348 calendar: event links not using user timezone