Determine logic for which pet to show next

[binamkayastha]

Ideally for MVP we do not want to rely on a database call. Previous iterations of this project used a "random" getter

CutePets (Petfinder API)
https://github.com/codeforamerica/CutePets/blob/master/spec/pet_fetcher_spec.rb#L24

CutePetsBoston (AdoptAPet API)
https://github.com/codeforboston/CutePetsBoston/blob/master/lib/cuties/adopt_a_pet.rb#L10

We could end up posting the same animal twice, though this may be fine for the mvp?

[binamkayastha]

We went with random