closes #21

This change means that in a tab based app, when pushing a screen
which did not declare `tabBarBackgroundColor` - the BottomTabs color
will persist from the previous screen and not be set to the default
color which is white. This eliminates the unwanted BottomTabs
background color change in this specific use case.

closes #409

CollapsingTopBar

This commit introduces a simple mechanism to pass deep link data from
MainActivity/SplashActivity to NavigationActivity. Note that this will
not work if the application is already running.

Fix example project

Also removes ContextualMenu after it is dismissed

Add support for ContextualMenu in TopBar

Fixes #338

fixes #330

fixes #309

Create tabs Left to Right