test for navCtrl.resetDb
autofocus
various minor stuff

move dishes.json, renamed addCorsHeaders, DishList utility functions
error handling if mongod is not running
changed the way we inject storage backend
rename server.go to handlers.go
encapsulate mongodb specifics
removed static app handle
refactoring of handlers

most specifically, defining and owning the app function interfaces, enabling isolated handler testing
simplistic strategy towards dealing with CORS requests