Git commits in Moodle 1.9.7 by Dongsheng Cai

commit deacd770bd23e9c6c65ab225fccc2f484139630d
Author: Dongsheng Cai <unoter@gmail.com>
Date:   Wed, 25 Nov 2009 14:36:19 +0800
Tag:    v1.9.7

"MDL-8677, fixed mimetype name"

commit dd4b038bbf8825f32e63ef728729aedb54221545
Author: Dongsheng Cai <unoter@gmail.com>
Date:   Thu, 19 Nov 2009 11:27:53 +0800
Tag:    v1.9.7

"MDL-20886, fixed message popup window for guest user"