Fixed example's option when re-enable any of the sides
New status bar option with variable opacity.

This solution mimics the contacts drawer used in the facebook App, where the status bar background becomes visible as the drawer opens.
New method for backwards compatibility. New property description.
New example options to test the Status Bar Background View.
New method for backwards compatibility. Getter.
Setting default aplha when changing statusBarBackgroundViewMode.
Fixed example's NavBar height when changing statusBarBackground Mode.