A couple of enhancements to websockets

- Provide whether a message was binary or text in websocket_message
   and handle.receive(). (Fixes #96)
 - Provide an optional reason and status code within the websocket_close
   event.

Off topic, but also cleanup the file handles a little.

src/main/java/dan200/computercraft/ComputerCraft.java

@@ -888,6 +888,18 @@ public class ComputerCraft
         return TurtleUpgrades.get( stack );
     }
 
+    @Deprecated
+    public static IPocketUpgrade getPocketUpgrade( String id )
+    {
+        return dan200.computercraft.shared.PocketUpgrades.get( id );
+    }
+
+    @Deprecated
+    public static ITurtleUpgrade getTurtleUpgrade( String id )
+    {
+        return TurtleUpgrades.get( id );
+    }
+
     @Deprecated
     public static IPeripheral getPeripheralAt( World world, BlockPos pos, EnumFacing side )
     {