User Registration and Price Parsing Strategy

Implement completed user registration framework, including login, logout, password reset, and register. The old price parsing strategy is to check the URL for updates, but we realized that a same item have different URL before and during sale. The new strategy: 1. For website with API, such as Amazon and Bestbuy, we will use that to retrieve to price. 2. For relative small website, such as jcrew and express, we will crawl the whole website and update the item database based on store product id.