Adds an UploadAlert model for storing information about significant uploads.
Adds the mailer skeleton
Add a boolean flag to the upload alerts field, indicating whether they've been sent out as part of a daily mailing yet.
Rename :type column to :content_type, turns out :type is a reserved keyword.
Adds queries for getting all alert uploads with a given significant content type and a notified status of false.
Add gem Figaro to the project.
Update configuration info so that we can actually send emails.
Initial work on template.
Refactor alert_item partial into alert_items partial that handles building the entire table.
Metadata mailer now tags alerts sent as part of an email as 'notified'
Add whenever to the project to handle sending the daily update email at a particular time.
Add a scheduled task to fire off that email at one in the morning.
Give the email that gets sent to only me a more meaningful subject line.
Add mailer configuration to the staging environment, update the schedule task
Update capistrano task to handle running whenever jobs in the staging environment.
Update staging.rb

Fix stale comment.
Merge pull request #199 from nu-lts/feature/significant_upload_email_alerts

Feature/significant upload email alerts