Refactor the code in KitKat & Compat CollapsingToolbarLayout

1. StatusBarCompatKitKat.java is more readable.
2. Compat CollapsingToolbarLayout better.

Fix bug & Compat CollapsingToolbarLayout

1. fix bug in translucentStatusBar().
2. add method to compat CollapsingToolbarLayout.
3. change demo.

v1.1.0

1. add fake view in DecorView.
2. remove useless code.

v1.0.1

1. add method to set alpha in status bar color
2. add method to hide status bar background when SDK >= 21 in full screen mode

v1.0.0

add to JitPack