Developer credits

Git commits in Moodle x.x.x by David Penner

commit c3b0e64d811dd74dedd6c8c50855cf11ed0b37e0
Author: David Penner <contributor@tracker.moodle.org>
Date:   Wed, 18 Jan 2012 11:19:27 +0800
Tag:    v2.1.5

MDL-31160 block_navigation: Fixed incorrect thrid arg to substr.

commit 5a479aa6286c72c6b00bfd8f19ee32e740c0f9e6
Author: David Penner <contributor@tracker.moodle.org>
Date:   Wed, 18 Jan 2012 11:19:27 +0800
Tag:    v2.2.2

MDL-31160 block_navigation: Fixed incorrect thrid arg to substr.

commit a0cc337bdb36b3bad144b34c2ec41df7f0438dbe
Author: David Penner <contributor@tracker.moodle.org>
Date:   Wed, 18 Jan 2012 11:19:27 +0800
Tag:    v2.3.0-beta

MDL-31160 block_navigation: Fixed incorrect thrid arg to substr.

commit 7547a5a3d69a421f10430d78c70ca418d30956ef
Author: David Penner <contributor@tracker.moodle.org>
Date:   Wed, 18 Jan 2012 11:19:27 +0800
Tag:    v2.4.0-beta

MDL-31160 block_navigation: Fixed incorrect thrid arg to substr.