Implemented PlayerChangedWorldEvent.

src/main/java/net/minecraft/server/ServerConfigurationManager.java

@@ -279,6 +279,7 @@ public class ServerConfigurationManager {
 
         // CraftBukkit start
         EntityPlayer entityplayer1 = entityplayer;
+        org.bukkit.World fromWorld = entityplayer1.getBukkitEntity().getWorld();
 
         if (location == null) {
             boolean isBedSpawn = false;
@@ -331,6 +332,10 @@ public class ServerConfigurationManager {
         entityplayer1.spawnIn(worldserver);
         entityplayer1.dead = false;
         entityplayer1.netServerHandler.teleport(new Location(worldserver.getWorld(), entityplayer1.locX, entityplayer1.locY, entityplayer1.locZ, entityplayer1.yaw, entityplayer1.pitch));
+
+        org.bukkit.event.player.PlayerChangedWorldEvent event = new org.bukkit.event.player.PlayerChangedWorldEvent((Player) entityplayer1.getBukkitEntity(), fromWorld);
+        Bukkit.getServer().getPluginManager().callEvent(event);
+
         // CraftBukkit end
         this.a(entityplayer1, worldserver);
         this.getPlayerManager(entityplayer1.dimension).addPlayer(entityplayer1);