User can submit feedback for pair #63
Task to send feedback request to recently ended appointment users #63
Fix styling on feedback page
User can view feedback #63
Notify feedback receiver of new feedback #63
Only send email via sendgrid in production.

Mailer settings were being specified in environment.rb which was overriding
any settings specified in environments/*.rb. Specifically I wanted to test
using mailcatcher and I was getting authentication errors that were very
hard to track down.

Also, I believe that Rails > 3.x should have configuration that belongs to
all environments live in config/application.rb.
Recently ended finds appointments ended in the last hour #63
Merge pull request #67 from Devbootcamp/appointment-feedback

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