Offline Twitter Login

Steps to reproduce.
1. ensure ipad/iphone has no internet connection.
2. Attempt to login to Twitter via - (void)showOAuthLoginControllerFromViewController:(UIViewController *)sender withCompletion:(void(^)(BOOL success))block
3. FHSTwitterEngineController remains on screen with activity indicator spinning

Expected Outcome
FHSTwitterEngineController should dismiss.
Merge pull request #38 from NathanMcBride/TwitterLogin_No_Internet

Offline Twitter Login