updating actionmailer_standalone example

ruby_ng/actionmailer_standalone/README.md

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+# action_mailer example
+
+This example shows how to send emails in worker.
+
+1. Be sure you've setup your Iron.io credentials, see main [README.md](https://github.com/iron-io/iron_worker_examples).
+2. Copy  `actionmailer_config_sample.json` to `actionmailer_config.json` and edit it to set your gmail credentials.
+3. Run `iron_worker upload actionmailer_standalone` to upload worker.
+4. Run `iron_worker queue actionmailer_standalone --payload-file actionmailer_config.json`
+5. Look at [HUD](https://hud.iron.io) to view your tasks running, check logs, etc.
+
+Read the code in this directory to learn more about what happened.

ruby_ng/actionmailer_standalone/actionmailer_config_sample.json

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+{
+  "gmail": {
+    "username": "you@gmail.com",
+    "password": "yourpwd"
+  },
+  "from": "you@gmail.com",
+  "to": ["you@gmail.com"]
+}

ruby_ng/actionmailer_standalone/actionmailer_standalone.worker

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+exec 'actionmailer_worker.rb'
+file 'mailer.rb'
+dir 'mailer'
+gem 'actionmailer'