Organize examples.

examples/multi.js

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+var redis  = require("redis"),
+    client = redis.createClient(), set_size = 20;
+
+client.sadd("bigset", "a member");
+client.sadd("bigset", "another member");
+
+while (set_size > 0) {
+    client.sadd("bigset", "member " + set_size);
+    set_size -= 1;
+}
+
+// multi chain with an individual callback
+client.multi()
+    .scard("bigset")
+    .smembers("bigset")
+    .keys("*", function (err, replies) {
+        client.mget(replies, redis.print);
+    })
+    .dbsize()
+    .exec(function (err, replies) {
+        console.log("MULTI got " + replies.length + " replies");
+        replies.forEach(function (reply, index) {
+            console.log("Reply " + index + ": " + reply.toString());
+        });
+    });
+
+client.mset("incr thing", 100, "incr other thing", 1, redis.print);
+
+// start a separate multi command queue
+var multi = client.multi();
+multi.incr("incr thing", redis.print);
+multi.incr("incr other thing", redis.print);
+
+// runs immediately
+client.get("incr thing", redis.print); // 100
+
+// drains multi queue and runs atomically
+multi.exec(function (err, replies) {
+    console.log(replies); // 101, 2
+});
+
+// you can re-run the same transaction if you like
+multi.exec(function (err, replies) {
+    console.log(replies); // 102, 3
+    client.quit();
+});