adds products with some reviews
index.html now renders each product's review above review form
adds empty review object to review controller. In preparation for ng-submit
updates view and models to account for review object in review controller
adds submit button
adds method for adding review in ReviewController
adds event listeners to all forms to preventDefault behavior on submit. Uses vanilla javascript
adds ng-submit to form. executes ReviewController.addReview(product) on submission
resets ReviewController.review after each review is submitted
adds ng-submit to notes