Add image and tags for metaballs example.

Arctic-0 · Sep 4, 2016 · 199b9ed · 199b9ed
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diff --git a/example/img/metaball.png b/example/img/metaball.png
diff --git a/example/metaball.js b/example/metaball.js
@@ -1,4 +1,6 @@
 /*
+  tags: advanced
+
   <p>Metaball rendering demo. Many ideas and code taken from <a href="https://www.clicktorelease.com/code/bumpy-metaballs">here</a></p>
 
  */