Add example send with generators version

examples/tutorials/send_generators.js

@@ -0,0 +1,40 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const co = require('co');
+const amqp = require('amqplib');
+
+co(function* () {
+  // connection errors are handled in the co .catch handler
+  const conn = yield amqp.connect('amqp://localhost');
+
+  // try catch will throw any errors from the yielding the following promises to the co .catch handler
+  try {
+    const q = 'hello';
+    const msg = 'Hello World!';
+
+    // use a confirm channel so we can check the message is sent OK.
+    const channel = yield conn.createConfirmChannel();
+
+    yield channel.assertQueue(q);
+
+    channel.sendToQueue(q, new Buffer(msg));
+
+    // if message has been nacked, this will result in an error (rejected promise);
+    yield channel.waitForConfirms();
+
+    console.log(" [x] Sent '%s'", msg);
+
+    channel.close();
+  }
+  catch (e) {
+    throw e;
+  }
+  finally {
+    conn.close();
+  }
+
+}).catch(err => {
+  console.warn('Error:', err);
+});