BUG: oauth2client deprecated, use google-auth instead.

Remove the use of oauth2client and use google-auth library, instead.
See GH#37.

Rather than check for multiple versions of the libraries, use the
setup.py to specify compatible versions. I believe this is safe since
Pandas checks for the pandas_gbq package.

Since google-auth does not use the argparse module to override user
authentication flow settings, add a parameter to choose between the web
and console flow.

Addresses some eventual consistency issues in table/dataset listing in
the integration tests.

Author: tswast

.gitignore

@@ -76,3 +76,7 @@ Thumbs.db
 
 # caches #
 .cache
+
+# Credentials #
+###############
+bigquery_credentials.dat

ci/requirements-2.7-0.19.2.pip

@@ -1,5 +1,7 @@
-httplib2
-google-api-python-client==1.2
-python-gflags==2.0
-oauth2client==1.5.0
+google-api-python-client
+google-auth
+google-auth-httplib2
+google-auth-oauthlib
 PyCrypto
+python-gflags==2.0
+mock

ci/requirements-3.5-0.18.1.pip

@@ -1,3 +1,5 @@
-httplib2
 google-api-python-client
-oauth2client
+google-auth
+google-auth-httplib2
+google-auth-oauthlib
+mock

ci/requirements-3.6-0.20.1.pip

@@ -1,3 +1,5 @@
-httplib2
 google-api-python-client
-oauth2client
+google-auth
+google-auth-httplib2
+google-auth-oauthlib
+mock

ci/requirements-3.6-MASTER.pip

@@ -1,3 +1,5 @@
-httplib2
 google-api-python-client
-oauth2client
+google-auth
+google-auth-httplib2
+google-auth-oauthlib
+mock

docs/source/changelog.rst

@@ -4,10 +4,10 @@ Changelog
 0.2.0 / 2017-??-??
 ------------------
 
-- Resolve issue where the optional ``--noauth_local_webserver`` command line argument would not be propagated during the authentication process. (:issue:`35`)
 - Drop support for Python 3.4 (:issue:`40`)
 - The dataframe passed to ```.to_gbq(...., if_exists='append')``` needs to contain only a subset of the fields in the BigQuery schema. (:issue:`24`)
-
+- Use the `google-auth <https://google-auth.readthedocs.io/en/latest/>`__ library for authentication because oauth2client is deprecated. (:issue:`39`)
+- ``read_gbq`` now has a ``auth_local_webserver`` boolean argument for controlling whether to use web server or console flow when getting user credentials.
 
 0.1.6 / 2017-05-03
 ------------------