v4.1.0

• improve performance to set hasStableIds
• remove default itemAnimator because it causes some strange effects with setHasStableIds
• bring in new RecyclerViewCacheUtil to bring a solution to completely fix the lag when using many different drawerItem types inside a scrollable Drawer FIX #642
• improve safety of updateBadge, updateName, updateIcon methods
• improve ColorHolder
• use DimenHolder, ColorHolder, ImageHolder to improve AccountHeader
• add new api method to set the header background via the result object