forgot to remove the tests that went with the old products.js db simulator
Fixes #28 to enable session cookies withing the app:
  - package.json: added the connect-pg-simple module to store session info
    on pg db
  - dbConnect + test_...: added getConfig function to share db credentials
    with other parts of the app
  - web.js: added session cookies with initialization and '/views' for
    debug purpose
added number of items in cart via middleware
add to cart sends the right request to server. server-side needs to handle the request properly still.
optimizing /paymentSuccess route and logging information received from paypal and improved paymentSuccess handling
added addToCart input validation + quantity selection #9