presentationStyle / transitionStyle

Add presentationStyle and transitionStyle to UIViewController present_modal

Sorry, can't get working tests, I receive 

``` - should have `present_modal` and `dismiss_modal` methods
2014-10-31 21:48:46.527 SugarCube[7120:1016325] Warning: Attempt to present <UIViewController: 0xc2fba90> on <UIViewController: 0xc2fbdb0> whose view is not in the window hierarchy!```