changed config loading from include_once to require 
changed config loading from include_once to require 

this circumvents some issues we had on our production servers, but does not introduce any performance problems, since these requires are only called once if the config has not been initialized yet

git-svn-id: 84334937b86421baa0e582c4ab1a9d358324cbeb@987392 13f79535-47bb-0310-9956-ffa450edef68

apache/shindig,apache/shindig,apache/shindig,apparentlymart/shindig,apache/shindig,apparentlymart/shindig,apache/shindig,apparentlymart/shindig,apparentlymart/shindig