docs: update docs

CONTRIBUTING.rst

@@ -11,7 +11,7 @@ Here are some guidelines for hacking on ``google-auth-library-python``.
 Making changes
 --------------
 
-A few notes on making changes to ``google-auth-libary-python``.
+A few notes on making changes to ``google-auth-library-python``.
 
 - If you've added a new feature or modified an existing feature, be sure to
   add or update any applicable documentation in docstrings and in the
@@ -37,11 +37,11 @@ Running system tests
 
 You can run the system tests with ``nox``::
 
-    $ nox -s system
+    $ nox -f system_tests/noxfile.py
 
 To run a single session, specify it with ``nox -s``::
 
-    $ nox -s service_account
+    $ nox -f system_tests/noxfile.py -s service_account
 
 To run system tests locally, you will need to set up a data directory.
 
@@ -78,7 +78,7 @@ From ``system_tests/app_engine_test_app`` run the following commands.
 After the app is deployed, change ``service`` in ``app.yaml`` back to ``google-auth-system-tests``. 
 You can now run the App Engine tests:
 
-    $ nox -s app_engine
+    $ nox -f system_tests/noxfile.py -s app_engine
 
 Coding Style
 ------------

README.rst

@@ -6,16 +6,10 @@ Google Auth Python Library
 This library simplifies using Google's various server-to-server authentication
 mechanisms to access Google APIs.
 
-.. |build| image:: https://travis-ci.org/GoogleCloudPlatform/google-auth-library-python.svg?branch=master
-   :target: https://travis-ci.org/GoogleCloudPlatform/google-auth-library-python
 .. |docs| image:: https://readthedocs.org/projects/google-auth/badge/?version=latest
    :target: https://google-auth.readthedocs.io/en/latest/
 .. |pypi| image:: https://img.shields.io/pypi/v/google-auth.svg
    :target: https://pypi.python.org/pypi/google-auth
-.. |compat_check_pypi| image:: https://python-compatibility-tools.appspot.com/one_badge_image?package=google-auth
-   :target: https://python-compatibility-tools.appspot.com/one_badge_target?package=google-auth
-.. |compat_check_github| image:: https://python-compatibility-tools.appspot.com/one_badge_image?package=git%2Bgit%3A//github.com/googleapis/google-auth-library-python.git
-   :target: https://python-compatibility-tools.appspot.com/one_badge_target?package=git%2Bgit%3A//github.com/googleapis/google-auth-library-python.git
 
 Installing
 ----------

docs/conf.py

@@ -368,7 +368,7 @@
 intersphinx_mapping = {
     'python': ('https://docs.python.org/3.5', None),
     'urllib3': ('https://urllib3.readthedocs.io/en/stable', None),
-    'requests': ('http://docs.python-requests.org/en/stable', None),
+    'requests': ('https://requests.kennethreitz.org/en/master/', None),
     'requests-oauthlib': (
         'http://requests-oauthlib.readthedocs.io/en/stable', None),
 }