Fixed a crash when placing new furnaces

git-svn-id: http://mc-server.googlecode.com/svn/trunk@1610 0a769ca7-a7f5-676a-18bf-c427514a06d6
Implemented hopper output

git-svn-id: http://mc-server.googlecode.com/svn/trunk@1611 0a769ca7-a7f5-676a-18bf-c427514a06d6