Adding pg to gems
Purchases requests can be created and retrieved in purchaserequestrepo, purchaserequest can be used to created the purcaserequest class object
breedrepo created using DB (postgres), added ability to update price using set_breed_price, creates table when initalized, tests created for each method and to check for nil when object not created in the db, puppy_breeder.rb requires pg and new breed_repo.rb