Add auto-resize TabBar on OrientationChange

When adding ```android:configChanges="keyboardHidden|orientation|screenSize"``` on Activity declaration, the TabBar got too big or to small when changing orientation, small fix in code by adding the OnOrientationChange method (delay is required, but dirty solution - works for now)
Bugfix: check if pager is not null
Support for ActionMode

Finish ActionMode when sliding to another Page, simply call ```tabIndicator.setActionMode(mActionMode);``` in ```onCreateActionMode```
Update PaperButton.java

setText now supported
Merge pull request #1 from MDXDave/master

Add auto-resize TabBar on OrientationChange