api

- GET /uuid/:uuid
- skip verify_authenticity_token for POST /movies/
- POST movie with remote file urls
- ping callback url when conversion complete(web hook)
  - passing movie uuid

client implementation: https://github.com/shin1ohno/jani-converter_client/pull/1/files

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@l15n please review
Will the callback URL never have any parameters? 

i.e. is it possible that you'll have a callback URL that turns into `http://example.com/test?a=1?uuid=uuid` ?