Update to 20160106 OS X Preview for Developers release.

byuu says:

New update. Most of the work today went into eliminating hiro::Image
from all objects in all ports, replacing with nall::image. That took an
eternity.

Changelog:
- fixed crashing bug when loading games [thanks endrift!!]
- toggling "show status bar" option adjusts window geometry (not
  supposed to recenter the window, though)
- button sizes improved; icon-only button icons no longer being cut off

ruby/ruby.hpp

@@ -1,3 +1,5 @@
+#pragma once
+
 /* ruby
  * author: byuu
  * license: ISC
@@ -7,9 +9,6 @@
  * it provides a common interface to video, audio and input devices
  */
 
-#ifndef RUBY_HPP
-#define RUBY_HPP
-
 #include <nall/nall.hpp>
 
 namespace ruby {
@@ -107,5 +106,3 @@ private:
 };
 
 }
-
-#endif