Fix crash with BottomNavigationView

The crash appear when using this library and the com.android.support:design > 25.2.0.

The crash come from the save / restore state. With this configuration, the app crash with
ClassNotFoundException when unmarshalling: android.support.design.widget.BottomNavigationView$SavedState because with the version 25.2.0, the class does not exist.

Add support for Jitpack

Add support for Jitpack for gradle import