issue-933: Fixed issue where NavigationDrawerController was not displaying the leftViewController and rightViewController.

issue-940: Fixed an issue where the TransitionController was not executing the lifecycle functions for the initial rootViewController.

Change access level for line in TabBar to open

issue-931: Fixed issue where selectedTabItem was not updated correctly during a porgrammatic transition.

Tab bar controller dynamically adds & removes child view controllers

Revert "Tab bar controller dynamically adds & removes child view controllers"

Tab bar controller dynamically adds & removes child view controllers

Tabs controller performs dynamic adding and removing of the tab view controller upon transitioning between view controllers.

Tab bar objective-c prefixes

Provided default values for when user set's nil as color for tab bar items.