Version 4.0.1

• Add ShareActionProvider widget for use as action items.
• Re-add 'Styled' sample to provide a more comprehensive theming example.
• Fix: Do not dispatch options item selection to fragments if the activity
  handles the callback.
• Fix: Prevent menu key from opening the overflow menu when an action mode is
  currently displayed.
• Fix: Ensure fragment transaction instance is not null on initial tab
  selection callback.
• Fix: Displaying an action mode while using stacked tab navigation no longer
  throws an exception.
• Fix: Using expandable action item callbacks no longer results in a possible
  exception on older devices.