move www.js to lib

it's not a binary, why is this in bin?

lib/www.js

@@ -0,0 +1,21 @@
+var logging = require ("../lib/logging");
+var cleaner = require("../lib/cleaner");
+var config = require("../lib/config");
+var cluster = require("cluster");
+
+if (cluster.isMaster) {
+  var cores = config.clusters || require("os").cpus().length;
+  logging.log("Starting", cores + " workers");
+  for (var i = 0; i < cores; i++) {
+    cluster.fork();
+  }
+
+  cluster.on("exit", function (worker) {
+    logging.error("Worker #" + worker.id + " died. Rebooting a new one.");
+    setTimeout(cluster.fork, 100);
+  });
+
+  setInterval(cleaner.run, config.cleaning_interval * 1000);
+} else {
+  require("../server.js").boot();
+}