New tests added to Breed/BreedRepo class for implementing PostgreSQL.

Now the breed_spec tests for initialization of an instance of the class breed.
Other tests have been deleted due to shifting the responsility of retrieving and pushing data to breed_repo.
Breed_repo tests for: 1. adding a breed to database
2. finding a breed through the database (which should come back in readable form through class method prettify_breed.
3. updates the price of the breed in database.