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/CraftEnderDragon.java

@@ -11,22 +11,27 @@ import org.bukkit.entity.ComplexEntityPart;
 import org.bukkit.entity.EnderDragon;
 
 public class CraftEnderDragon extends CraftComplexLivingEntity implements EnderDragon {
-    public CraftEnderDragon(CraftServer server, EntityLiving entity) {
+    public CraftEnderDragon(CraftServer server, EntityEnderDragon entity) {
         super(server, entity);
     }
 
     public Set<ComplexEntityPart> getParts() {
         Builder<ComplexEntityPart> builder = ImmutableSet.builder();
-        
+
         for (EntityComplexPart part : getHandle().f) {
-            builder.add((ComplexEntityPart)part.getBukkitEntity());
+            builder.add((ComplexEntityPart) part.getBukkitEntity());
         }
-        
+
         return builder.build();
     }
 
     @Override
     public EntityEnderDragon getHandle() {
-        return (EntityEnderDragon)super.getHandle();
+        return (EntityEnderDragon) entity;
+    }
+
+    @Override
+    public String toString() {
+        return "CraftEnderDragon";
     }
 }