small updates to README
Refactor batches controller: move the getting of @event into a before_filter.
Moving from discount_codes to access_codes: MIGRATION: added eventbrite_ticket_id to ticket_kinds table.
Moving from discount_codes to access_codes: Add ability to set the Eventbrite ticket for our ticket_kinds.

When I'm finished, future codes created will be Eventbrite access_codes instead of discount_codes. Access_codes reveal hidden free tickets, such as a "Sponsor", "Media", or "Volunteer" ticket, which is better than a discount_code giving 100% off a "Regular" ticket.
Moving from discount_codes to access_codes: MIGRATION: added is_access_code to ticket_kinds table.

Going to allow creation of both Eventbrite discount_code and access_code.
Added event#name_for_ticket method.
MIGRATION: add event_id to ticket.
Move assign_event method to application controller.
Add event to tickets#index, and reorganize table to fit more in.
Add prefix and "Eventbrite ticket to show" to ticket_kinds#index.
Fixes to tickets, ticket_kinds specs after recent code updates.
Adding Eventbrite access_codes: depending on ticket_kind.is_access_code, choose the right code to register.

I've now decided to keep discount_codes as well.
Adding Eventbrite access_codes: add more info about ticket_kind code types to ticket_kinds#index.
Fixes and updates to ticket_kinds form.

Show correct value of is_access_code checkbox. 
Hide eventbrite ticket listing if not is_access_code.
Show separate list of access & discount ticket kinds on batches#new.

Note: must update database so that ticket_kind.is_access_code is true or false for all records.
Fix setting Eventbrite event_id for new tickets.
Fix n+1 queries problem on tickets#index: include associated ticket_kind records.
Add note for access codes in tickets#index.
Store the list of Eventbrite tickets (used for access codes) in the secrets file.
Fix specs broken by code changes for adding Eventbrite access_codes.

TODO: add specs for register_access_code.