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/CraftArrow.java

@@ -7,29 +7,35 @@ import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.entity.Arrow;
 import org.bukkit.entity.LivingEntity;
 
+import javax.swing.text.html.parser.Entity;
+
 public class CraftArrow extends AbstractProjectile implements Arrow {
 
     public CraftArrow(CraftServer server, EntityArrow entity) {
         super(server, entity);
     }
 
-    @Override
-    public String toString() {
-        return "CraftArrow";
-    }
-
     public LivingEntity getShooter() {
-        if (((EntityArrow) getHandle()).shooter != null) {
-            return (LivingEntity) ((EntityArrow) getHandle()).shooter.getBukkitEntity();
+        if (getHandle().shooter != null) {
+            return (LivingEntity) getHandle().shooter.getBukkitEntity();
         }
 
         return null;
-
     }
 
     public void setShooter(LivingEntity shooter) {
         if (shooter instanceof CraftLivingEntity) {
-            ((EntityArrow) getHandle()).shooter = (EntityLiving) ((CraftLivingEntity) shooter).entity;
+            getHandle().shooter = ((CraftLivingEntity) shooter).getHandle();
         }
     }
+
+    @Override
+    public EntityArrow getHandle(){
+        return (EntityArrow) entity;
+    }
+
+    @Override
+    public String toString() {
+        return "CraftArrow";
+    }
 }