Auto build when attribute that are declared as factories

[AlexO-123]

FakerMaker.factory :structured_address do
  buildingName { Faker::Address.building_number }
  thoroughfareName { Faker::Address.street_name }
  country { ['Wales', 'Scotland', 'Northern Ireland', 'England'].sample }
  postcode { Faker::Address.postcode }
  language { %w[EN CY].sample }
  postTown { Faker::Address.city }
end

FakerMaker.factory :user do
  name { Faker::Name.name }
  email { Faker::Internet.email }
  address { FakerMaker[:structured_address]}
end

FM[:user].build should also build the address

[BillyRuffian]

added to v2.1.0