add dark theme

example/layout/about.lua

@@ -0,0 +1,12 @@
+return { style = 'dialog',
+    { style = 'dialogHead', text = 'About LUIGI' },
+    { style = 'dialogBody', align = 'left middle', padding = 24, icon = 'logo.png', text = [[
+Lovely User Interfaces for Game Inventors
+
+Copyright (c) 2015 airstruck
+]]  },
+    { style = 'dialogFoot',
+        {}, -- spacer
+        { style = 'dialogButton', id = 'closeButton', text = 'Close' }
+    }
+}