Fixing issues with share view and hidden keyboard on iPad.
Removing redundant iPad story rotation behavior.

-[StoryPageControl layoutForInterfaceOrientation:] already invokes -refreshPages.

-[NewsBlurAppDelegate hideShareView:] already invokes -transitionFromShareView.
Stopping animation of share view/keyboard before orientation has changed.
Merge pull request #401 from nriley/share-keyboard

Share view/hidden keyboard fixes