added handy example of using sort command using code posted by linus in mranney/node_redis/#103

examples/sort.js

@@ -0,0 +1,17 @@
+var redis = require("redis"),
+    client = redis.createClient();
+
+client.sadd("mylist", 1);
+client.sadd("mylist", 2);
+client.sadd("mylist", 3);
+
+client.set("weight_1", 5);
+client.set("weight_2", 500);
+client.set("weight_3", 1);
+
+client.set("object_1", "foo");
+client.set("object_2", "bar");
+client.set("object_3", "qux");
+
+client.sort("mylist", "by", "weight_*", "get", "object_*", redis.print);
+// Prints Reply: qux,foo,bar