Fixed issue-29, unbalanced calls to begin/end appearance transitions

Calling {begin,end}AppearanceTransition methods for modal transitions
was causing the issue since UIKit was already calling them that internally

pr-40: Fixed delegation issue, where UINavigationController and UITabBarController were incorrectly calling their delegate methods

Fixed overridden delegates were not forwarded

issue-1022: Fixed alpha issue, where alpha was being set to 1 and not respecting the initial set alpha value

updated Motion internals to remove motion only animations and handle TabBar animations when being pushed with hideBottomBarWhenPushed