Changing auth to use implicit environment.
Removing superfluous patches in test_generate_signed_url_w_expiration_int.
Changing description of GOOGLE_APPLICATION_CREDENTIALS.
Merge pull request #419 from dhermes/add-better-auth

Changing auth to use implicit environment.
Update encrypted key for regression tests
Expose the 'more_results' value fetched from the back-end.

Include notes that it is known to be currently un-useful, since the
back-end sets it to indicate there are more results willy-nilly.

Fixes #423.
Mention versioning policy in README
Merge pull request #426 from silvolu/version-policy-readme

Mention versioning policy in README
Merge pull request #425 from tseaver/423-expose_query_more_results

Fix #423:  Expose the 'more_results' value fetched from the back-end.