Map org.bukkit.Sound to String values for sending to client.

This change was done to remove the internal sound names from the API.
Along with moving the internal names into CraftBukkit, a unit test was
added for any new sounds added in the API to assure they have a non-null
mapping.

src/main/java/org/bukkit/craftbukkit/CraftWorld.java

@@ -1171,6 +1171,6 @@ public class CraftWorld implements World {
         double y = loc.getY();
         double z = loc.getZ();
 
-        getHandle().makeSound(x, y, z, sound.getSound(), volume, pitch);
+        getHandle().makeSound(x, y, z, CraftSound.getSound(sound), volume, pitch);
     }
 }