Uses Postmark to process Google Alerts emails, and post the new results to a Campfire chatroom.
Prompted by Postmark's contest.
For the smoothest experience, I recommend creating a new user in your Campfire account just for alerts. If you are logged into Campfire as the same user that you have configured on campfire-alerts, you will not always see alerts as soon as they post into the room.
You will need to set a few environment variables to tell campfire-alerts how to connect to your Campfire room.
ENV['CAMPFIRE_SUBDOMAIN'] # => the subdomain of your Campfire account
ENV['CAMPFIRE_AUTH_TOKEN'] # => your API authentication token. Find it by clicking the "My info" link in the upper-right of the Campfire UI.
ENV['CAMPFIRE_ROOM_NAME'] # => the name of the room to post alerts into
If you're running on Heroku, you can set these variables using heroku config from the commandline. https://devcenter.heroku.com/articles/config-vars
Once you've deployed campfire-alerts to some publicly-accessible part of the web, you need to configure your Postmark account to post incoming alerts to your server. Just configure an inbound server following Postmark's instructions. If your web server is set up at http://campfire-alerts.example.com/, then your webhook URL will be http://campfire-alerts.example.com/postmark_callbacks
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