change plugin name first letter to lowercase

git-svn-id: https://plugins.svn.wordpress.org/wpdiscuz/trunk@1036189 b8457f37-d9ea-0310-8a92-e5e31aec5664
change plugin name

git-svn-id: https://plugins.svn.wordpress.org/wpdiscuz/trunk@1036192 b8457f37-d9ea-0310-8a92-e5e31aec5664