Added the mandrill api tp packages

Since sg_status needs to not use SG to send the message, we're using
Mandrill instead.

need to run:
npm install mandrill-api
Changed sg_status.coffee to use Mandrill

This adds the http node to be used.
Changed sg_status to use Mandrill

These call the arguments for the cURL; couldn't get them to work inline.
Changed sg_status to use Mandrill

Removed the old Unix 'mail' commands that are killing bot.
Changed sg_status to use Mandrill

This initiates, writes data to, and closes the cURL.
Changed sg_status to use Mandrill

This updates the response to HC, so that the agent can see any possible
problems.