Clients are deleted when the world is stopped.
Clients are deleted when the world is stopped.

This fixes #92.

Haxi52/cuberite,kevinr/cuberite,thetaeo/cuberite,Tri125/MCServer,bendl/cuberite,nicodinh/cuberite,mjssw/cuberite,nicodinh/cuberite,mmdk95/cuberite,Howaner/MCServer,mmdk95/cuberite,ionux/MCServer,mmdk95/cuberite,thetaeo/cuberite,nicodinh/cuberite,Tri125/MCServer,jammet/MCServer,MuhammadWang/MCServer,mc-server/MCServer,guijun/MCServer,nevercast/cuberite,ionux/MCServer,tonibm19/cuberite,mjssw/cuberite,jammet/MCServer,QUSpilPrgm/cuberite,jammet/MCServer,Altenius/cuberite,Haxi52/cuberite,MuhammadWang/MCServer,MuhammadWang/MCServer,Tri125/MCServer,mc-server/MCServer,HelenaKitty/EbooMC,nichwall/cuberite,birkett/MCServer,nicodinh/cuberite,Haxi52/cuberite,tonibm19/cuberite,linnemannr/MCServer,HelenaKitty/EbooMC,nicodinh/cuberite,mc-server/MCServer,SamOatesPlugins/cuberite,nounoursheureux/MCServer,birkett/MCServer,guijun/MCServer,Frownigami1/cuberite,Howaner/MCServer,jammet/MCServer,johnsoch/cuberite,birkett/cuberite,marvinkopf/cuberite,Howaner/MCServer,thetaeo/cuberite,birkett/cuberite,mc-server/MCServer,nichwall/cuberite,linnemannr/MCServer,Schwertspize/cuberite,johnsoch/cuberite,Altenius/cuberite,MuhammadWang/MCServer,Schwertspize/cuberite,jammet/MCServer,johnsoch/cuberite,birkett/MCServer,Frownigami1/cuberite,thetaeo/cuberite,birkett/cuberite,linnemannr/MCServer,jammet/MCServer,HelenaKitty/EbooMC,johnsoch/cuberite,tonibm19/cuberite,johnsoch/cuberite,SamOatesPlugins/cuberite,nevercast/cuberite,SamOatesPlugins/cuberite,ionux/MCServer,QUSpilPrgm/cuberite,kevinr/cuberite,QUSpilPrgm/cuberite,mc-server/MCServer,marvinkopf/cuberite,nichwall/cuberite,Fighter19/cuberite,Fighter19/cuberite,birkett/MCServer,Schwertspize/cuberite,bendl/cuberite,linnemannr/MCServer,Haxi52/cuberite,mmdk95/cuberite,bendl/cuberite,zackp30/cuberite,birkett/MCServer,tonibm19/cuberite,Schwertspize/cuberite,guijun/MCServer,mjssw/cuberite,Frownigami1/cuberite,QUSpilPrgm/cuberite,Fighter19/cuberite,zackp30/cuberite,Haxi52/cuberite,nichwall/cuberite,linnemannr/MCServer,marvinkopf/cuberite,electromatter/cuberite,HelenaKitty/EbooMC,zackp30/cuberite,Altenius/cuberite,nounoursheureux/MCServer,HelenaKitty/EbooMC,bendl/cuberite,electromatter/cuberite,marvinkopf/cuberite,QUSpilPrgm/cuberite,zackp30/cuberite,QUSpilPrgm/cuberite,electromatter/cuberite,nevercast/cuberite,ionux/MCServer,zackp30/cuberite,Tri125/MCServer,guijun/MCServer,zackp30/cuberite,Fighter19/cuberite,nounoursheureux/MCServer,kevinr/cuberite,mjssw/cuberite,marvinkopf/cuberite,guijun/MCServer,ionux/MCServer,mjssw/cuberite,Altenius/cuberite,electromatter/cuberite,nounoursheureux/MCServer,Frownigami1/cuberite,linnemannr/MCServer,mmdk95/cuberite,Howaner/MCServer,kevinr/cuberite,bendl/cuberite,nichwall/cuberite,nounoursheureux/MCServer,nounoursheureux/MCServer,Tri125/MCServer,SamOatesPlugins/cuberite,mmdk95/cuberite,Howaner/MCServer,Schwertspize/cuberite,Howaner/MCServer,mc-server/MCServer,electromatter/cuberite,birkett/cuberite,nichwall/cuberite,tonibm19/cuberite,birkett/cuberite,nevercast/cuberite,MuhammadWang/MCServer,marvinkopf/cuberite,ionux/MCServer,electromatter/cuberite,nevercast/cuberite,tonibm19/cuberite,SamOatesPlugins/cuberite,nevercast/cuberite,kevinr/cuberite,thetaeo/cuberite,thetaeo/cuberite,Fighter19/cuberite,Haxi52/cuberite,Tri125/MCServer,Fighter19/cuberite,nicodinh/cuberite,mjssw/cuberite,kevinr/cuberite,guijun/MCServer,birkett/MCServer,birkett/cuberite,Altenius/cuberite,Frownigami1/cuberite