Developer credits

Git commits in Moodle 1.9.11 by Dongsheng Cai

commit 009fca2bb4ceed57a62b02ef935273cf07358d2c
Author: Dongsheng Cai <dongsheng@moodle.com>
Date:   Mon, 20 Dec 2010 17:19:25 +0800
Tag:    v1.9.11

category editing MDL-21671 MOODLE_19_STABLE check capability when parent category changed

commit 5b6519cb42651a2629d93a9eb936492b8ee00d41
Author: Dongsheng Cai <dongsheng@moodle.com>
Date:   Mon, 20 Dec 2010 11:07:32 +0800
Tag:    v1.9.11

MDL-21671, MOODLE_19_STABLE site level categroy manage capability when edit category, credits to Vadim Dvorovenko

commit 42d9cf7dffe8ce68f0775da54c178c4f227b17fe
Author: Dongsheng Cai <dongsheng@moodle.com>
Date:   Wed, 15 Dec 2010 16:19:56 +0800
Tag:    v1.9.11

MDL-14934 fixed excel time in MOODLE_19_STABLE credits to Jonathon Fowler