Adds business intelligence endpoint 'GET /api/v1/merchants/most_items?quantity=x' that returns the top x merchants ranked by total number of items sold.
-adds custom route 'most_items'
-adds most_items controller to merchants
-adds custom method 'most_items' to merchant model
-all tests/spec harness passing
Adds business intelligence endpoint 'GET /api/v1/merchants/most_items?quantity=x' that returns the top x merchants ranked by total number of items sold. -adds custom route 'most_items' -adds most_items controller to merchants -adds custom method 'most_items' to merchant model -all tests/spec harness passing