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/CraftTNTPrimed.java

@@ -11,16 +11,6 @@ public class CraftTNTPrimed extends CraftEntity implements TNTPrimed {
         super(server, entity);
     }
 
-    @Override
-    public String toString() {
-        return "CraftTNTPrimed";
-    }
-
-    @Override
-    public EntityTNTPrimed getHandle() {
-        return (EntityTNTPrimed) super.getHandle();
-    }
-
     public float getYield() {
         return getHandle().yield;
     }
@@ -45,4 +35,14 @@ public class CraftTNTPrimed extends CraftEntity implements TNTPrimed {
         getHandle().fuseTicks = fuseTicks;
     }
 
+    @Override
+    public EntityTNTPrimed getHandle() {
+        return (EntityTNTPrimed) entity;
+    }
+
+    @Override
+    public String toString() {
+        return "CraftTNTPrimed";
+    }
+
 }