Google API PHP Client 1.0.0 Update

- Upgraded to Google API PHP Client 1.0.0.
    - Changes mostly related to this: https://developers.google.com/api-client-library/php/guide/migration
- Fixed some compatibility issues when migrating to the new client version.
    - Removed Simple API key in authenticated requests (see http://stackoverflow.com/questions/21020898/403-error-with-messageaccess-not-configured-please-use-google-developers-conso)
    - Removed deprecated flags
    - Added flags where defaults had been changed.
- Fixed some issues that could arise with read-only WP environments.
    - Read/write file streams not supported by S3 Stream Wrapper. File output stream was set with w+ where it was only writing, not reading.