Delete event

Created the option to delete an event by:
*Delete button on each listing
*Clicking delete button removes the listing from database and dashboard view.
These should be `null: :false`. If you want to allow some fields to be blank, you can put `null: false, default: ""`. If you do want to allow `nulls`, I personally prefer to specify `null: true`. That way those reading my code after I write it know it was intentionally left as a possible `null` value.