Include the new Google Books app in backuptool.sh

This app is part of the new Gapps from the GRI40 N1 update.
Try it with these Gapps I packaged for lack of a better source.

Change-Id: Ib49fd13e0270dfa15d5e05843a6f11f2b2d6388e
http://bit.ly/hfgtL0
1 file changed