The GData APIs were deprecated starting in 2014, and should no longer be used.
UNMAINTAINED COMPONENT
This component is unmaintained. If you require API access to the Google api, please consider using https://code.google.com/p/google-api-php-client/
You can install using:
curl -s https://getcomposer.org/installer | php
php composer.phar install
At that point, follow the instructions in the documentation folder for actual usage of the component. (Documentation is forthcoming.)