Remove the card swipe code as it is no longer needed

- Add a card number field to the create form instead.
- Return to standard ActiveRecord validation errors, not weird JS
  overrides, but keep the existing data in the form if there is an error.
The flags table is no longer used because we no longer swipe cards
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Merge pull request #4 from issyl0/updates_twentyfourteen

Remove card swipe code that is no longer used