Cleaned up OpenGLUI samples and added Blasteroids.

samples/openglui/web/blasteroids.css

Index: samples/openglui/web/blasteroids.css
===================================================================
--- samples/openglui/web/blasteroids.css	(revision 0)
+++ samples/openglui/web/blasteroids.css	(revision 0)
@@ -0,0 +1,17 @@
+/**
+ * Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+ * for details. All rights reserved. Use of this source code is governed by a
+ * BSD-style license that can be found in the LICENSE file.
+ */
+
+*
+{
+    border: 0px;
+    margin: 0px;
+    padding: 0px;
+}
+
+#canvas {
+    background-color: blue;
+    vertical-align: top;
+}