adding disable-multisite-rewrites by JPry

git-svn-id: http://plugins.svn.wordpress.org/disable-multisite-rewrites/trunk@798945 b8457f37-d9ea-0310-8a92-e5e31aec5664
Initial version

git-svn-id: http://plugins.svn.wordpress.org/disable-multisite-rewrites/trunk@863391 b8457f37-d9ea-0310-8a92-e5e31aec5664
Adding plugin files