Create logic for monuments state -> pp relationships

[dantaeyoung]

Part 1 of the Predator-Prey model. (#12)

monument_to_relationships_logic

• This logic converts monument status to predator_prey relationship models between actors.
• Currently, this logic has no state, so can be calculated purely from the monument state (as received from the /monument endpoint).
  • This logic is conceptually a function: state_to_relations(monument_state) returns predator_prey relations.
  • It would be nice if this logic was abstracted from the operation - a clean JSON file, or a simple python dict full of functions.
  • The logic file should have a method that receives a monument state as a dict and return a predator_prey model as a Model instance.