Initial Commit
First commit
Embeded NavigationController, clean up unused code
Add TwitterEngine class and sharedEngine variable as a singleton
Add and bridge Obj-C request signing class
Added a twitterConsumer class, init with key and secret for signing request
add a private function to signRequest
Add a method to fetchRequestToken
Added a webview to authenticate
set theEngine's delegate in controller's init
add 2 button Refresh and Tweet
implement TwitterEngine's delegate
not allowing nil key and secret
Add a TwitterEngine protocol, delegate need to provide controller to present on
add a function to check if the client has been authenticated
if there is no error, handle response, parse token and present authentication webview  on main queue
rename to better described what kind of token it is
Implement NSCoding protocol on Token class
AccessToken as subclass of Token, with the capability to save and load accessToken in NSUserDefault via NSCoding protocol
Remove unncessary "Public" from classes and functions