Update the project for Xcode 5
Add method `tokenComponents` to NSURL class

Returns an NSDictionary containg the token components (access token,
refresh token, etc…)
Update README.md
Rework the `getAuthorizationURLUsingPIN` method

Allows now to get an authorization URL for all the authentication types
Add method `codeComponent` to NSURL class

Returns an NSString containing the pin code