Issue #207 -- add Data.js to the docs.

index.html

@@ -1245,6 +1245,11 @@ _([1, 2, 3]).value();
         <a href="http://osteele.com/sources/javascript/functional/">Functional JavaScript</a>,
         which includes comprehensive higher-order function support as well as string lambdas.
       </p>
+      
+      <p>
+        Michael Aufreiter's <a href="http://substance.io/#michael/data-js">Data.js</a>,
+        a data manipulation + persistence library for JavaScript.
+      </p>
 
       <p>
         Python's <a href="http://docs.python.org/library/itertools.html">itertools</a>.