simple Node.js API for food shop

1. Node.js v 6.10.0

1. Open './config/config.json' and specify all needable data (mongoUri, port, deleteTimeout). To install mongoDB you can use 'https://1cloud.ru/help/linux/Ustanovka-MongoDB-na-Ubuntu' for Ubuntu.
   
2. install node modules: "npm install"
   
3. fill test DB: "node ./lib/fillDb" (data is retrieving from ./config/config.json)
   
4. run tests: "npm test" (Note that it used test db in tests)
   
5. run application "npm start"
   

1. get available products list: GET localhost:3000/api/products
   
2. get your cart: GET localhost:3000/api/cart (cart is identified by sessionID and will be deleted in 5 min after last activity with cart)
   
3. add product to cart: POST localhost:3000/api/cart Body={ "product_id": "2", "quantity": 2 } (quantity should be integer in range [1,10])
   
4. delete product from cart: DEL localhost:3000/api/cart Body={"product_id": "2"}