Remove repo addition from README.

Running `heroku apps:create myapp` automatically creates a 'heroku'
remote repository. You can just commit changes to the code base, and
then attempt a push to heroku.
Install letter-opener.

This automatically opens up received emails in the
browser.
Merge branch 'master' into email-report

* master: (52 commits)
  Adding devise support helper to try and fix mystery failure on Jenkins
  Add comment
  Hide categories screen and default to non_public for events
  Update docs
  Update events api docs for shows to events change
  Handle events having multiple shows and appearing duplicate in the public events feed
  Display events instead of shows on the PublicEvents feed
  Put help text in ?
  Update events_api docs
  Add more information to the public events feed
  Update event api docs for changed fields
  Remove entering in other text field
  Separate out categories from the rest of event about
  Rename from and to to start_date and end_date
  Remove the root key from public events feed
  Starting on events_api docs
  Don't set primary category if already set
  Set the primary event category to Other when creating an event
  Set past events to Other primary category
  Don't include shows in events on the shows feed
  ...
Merge in master.
First version of daily report email in.
WIP daily report.
Move report logic out to its own class.
Clean email report. Make text table easier to read.
Add special instructions and daily total.
Ensure emails are rendered, even with content missing.
Move tag job to be in new job folder.
Set up cron job for emailing daily.
Skip sending daily report if organization didn't have orders.
Add donations report.
Only show donations table if org has kit.
Add organization name to each email.
Send report to org admin, not org itself.
Clarify ticket totals.
Update ArtfullyOSE Rails version.
Add receive_daily_sales_report column to orgs.