Retwis ported to modern Redis data types.

The example (and related documentation at redis.io) was not updated for
5 years. Redis had no sorted sets and hashes when the original code was
written (!). An update was really needed.

We also use a modern PHP client now: Predis. A copy is shipped within
this repository to make life easier to newcomers trying Redis for the
first time via this example.

footer.php

@@ -0,0 +1,4 @@
+<div id="footer">Redis is a very simple Twitter clone written in PHP as example application of the <a href="http://code.google.com/p/redis/">Redis key-value database</a></div>
+</div>
+</body>
+</html>