Update gradle plugin version.

Ensure that location is always there otherwise scanning does not work.

Bump version to v4.

v3.16, r54

r47, v3.15.0.2

read me updated - UPC support

Removed paypal link from Google Play version.

Update version.

Reformat the code.

Bump version to 3.14.1

Update the change log.

Make sure no ads are displayed when the donation app is installed.