Fixed a bug where the double height status bar would move the header too far down.
Removed the superficial header view and replaced it with a navigation controller.
Exposed the togglePicker method.
Restored the header to the MBTimelineViewController, but added some code to remove the header if its height is set to zero.
Merge pull request #3 from MosheBerman/feature/collapsible-header

Feature/collapsible header