Hoppers can be placed properly, but won't work yet. git-svn-id: http://mc-server.googlecode.com/svn/trunk@1583 0a769ca7-a7f5-676a-18bf-c427514a06d6
git-svn-id: http://mc-server.googlecode.com/svn/trunk@1533 0a769ca7-a7f5-676a-18bf-c427514a06d6
git-svn-id: http://mc-server.googlecode.com/svn/trunk@1527 0a769ca7-a7f5-676a-18bf-c427514a06d6