Added support for detecting the new _UINavigationBarBackIndicatorView so that tapping "Back" works correctly.
Renamed isNavigationBarContainerClass to isNavigationItemView
Added semicolon to method declaration to match code style.
Added setValue:forSliderWithAccessibilityLabel:

Based on discussion in pull request #229.
Treat the parent `UISearchBar` as the first responder when a `UISearchBarTextField` is the first responder.

This enables you to write natural test expectations against the `UISearchBar` accessibility label since the `UISearchBarTextField` instance is private and you cannot configure an accessibility label.
Merge pull request #248 from ksuther/kif-next

Added support for detecting the new _UINavigationBarBackIndicatorView
Merge pull request #250 from blakewatters/feature/UISearchBar-firstResponder

Treat parent `UISearchBar` as first responder when `UISearchBarTextField` instance is the first responder
Merge pull request #249 from kif-framework/kif-next-slider

Added setValue:forSliderWithAccessibilityLabel: