Simple notification framework

[captncraig]

This adds a notifications package to dnscontrol!

A notifier is a function that accepts domain, provider, message, error, and preview flag, and sends data to anywhere it likes. This will always be run after a correction is complete.

Can be run on preview or push by using -notify flag. Configuration is intended to be passed in creds.json under notifications key:

"r53": {
      ...
    },
    "gcloud": {
        ...
  } ,
  "notifications":{
      "bonfire_url": "https://chat.meta.stackexchange.com/feeds/rooms/123?key=xyz"
  }

Currently only implemented bonfire notification for stack internal chat. Easy additions in the future:

• Slack
• Email
• Generic http
• Simple body templating for some or all of above.

[tlimoncelli]

Wow! That's pretty cool!

Could you add some documentation and then merge it?

Tom
P.S. I think you mean s/nofitier/notifier/g