created bus intel methods for MerchantRepository, Item, and ItemRepository#most_revenue(x)
all tests are passing, all business intel is written for merchant, merchant repo, item, and first item repo method
refactored to reference db in repos. most tests pass, need to tease out the rest. bus intel methods are shot
all tests passing quickly with reference to database that loaded stubs. added a few lines of csv to fixtures to make all bus intel methods work