added LoginViewController and updated stroyboard
added Douban function section with seven new files to complete the login process ---- directly copied from old projects without modifying
merged DoubanViewController and LoginViewController and deleted DoubanViewController --- Next step is to update storyboard by adding LoginViewController
anded a WebView to LoginViewController, and changed @property 'webView' from code-defined to storyboard-defined IBOutlet
changed 'DoubanHeaders.h', now the Douban Login view can display properly
Fetched authentication Data
changed NSUserdefaults, and successfully displayed UserName!
deleted the Segue between 'MoreViewController' and 'LoginViewController', next step is to update the IBAction of the 'Login' button
acquired an instance of 'loginviewcontroller' from storyboard, and updated the code to decide whether to push to loginviewcontroller or not
fixed login/logout issue on both MoreViewController and MyBooksTableViewController, next is to auto jump when authentication is acquired