Fix Craft Entity constructors and toStrings.

Also, standardise getHandle and clean up in general.
getHandle is now using the 'entity' member variable instead of
super.getHandle, as this reduces the number of chained calls needed.

src/main/java/org/bukkit/craftbukkit/entity/CraftEnderPearl.java

@@ -1,14 +1,19 @@
 package org.bukkit.craftbukkit.entity;
 
-import net.minecraft.server.Entity;
+import net.minecraft.server.EntityEnderPearl;
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.entity.EnderPearl;
 
 public class CraftEnderPearl extends CraftProjectile implements EnderPearl {
-    public CraftEnderPearl(CraftServer server, Entity entity) {
+    public CraftEnderPearl(CraftServer server, EntityEnderPearl entity) {
         super(server, entity);
     }
 
+    @Override
+    public EntityEnderPearl getHandle() {
+        return (EntityEnderPearl) entity;
+    }
+
     @Override
     public String toString() {
         return "CraftEnderPearl";