Refactored dbaccess/image.go to generate bounded number of requests
Refactored dbaccess/food.go to be bounded
Refactored dbaccess/category.go to be bounded
Refactored dbaccess/restaurant.go to be bounded
Added a simple layer of caching to dbaccess/image.go
Added a thin caching layer on top of dbaccess/food.go
Added thin caching on top of dbaccess/category.go
Added a thin caching layer to dbaccess/restaurant.go
Added a simple response cache to main.go