Merge changes Id091acf5,Ie27b07ae,I701a2582,I32122d77 into nyc-mr1-dev

* changes:
  Start using return value of OnNavigationItemSelectedListener.
  Clean up BottomBar docs
  Force BottomNavigationView item labels to be singleLine.
  Clean-up BottomNavigationMenuView#onMeasure and other style fixes.