Add google.oauth2.flow - utility for doing OAuth 2.0 Authorization Flow (#100)

diff --git a/docs/_static/custom.css b/docs/_static/custom.css
index cd83aa8..b54dd24 100644
--- a/docs/_static/custom.css
+++ b/docs/_static/custom.css
@@ -1,3 +1,7 @@
+div.document {
+    width: 1040px;
+}
+
 code.descname {
     color: #4885ed;
 }
diff --git a/docs/conf.py b/docs/conf.py
index b045c8c..5dbac87 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -370,6 +370,8 @@
     '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-oauthlib': (
+        'http://requests-oauthlib.readthedocs.io/en/stable', None),
 }
 
 # Autodoc config
diff --git a/docs/reference/google.oauth2.flow.rst b/docs/reference/google.oauth2.flow.rst
new file mode 100644
index 0000000..bae5408
--- /dev/null
+++ b/docs/reference/google.oauth2.flow.rst
@@ -0,0 +1,7 @@
+google.oauth2.flow module
+=========================
+
+.. automodule:: google.oauth2.flow
+    :members:
+    :inherited-members:
+    :show-inheritance:
diff --git a/docs/reference/google.oauth2.rst b/docs/reference/google.oauth2.rst
index adb9403..5dc2406 100644
--- a/docs/reference/google.oauth2.rst
+++ b/docs/reference/google.oauth2.rst
@@ -12,6 +12,7 @@
 .. toctree::
 
    google.oauth2.credentials
+   google.oauth2.flow
    google.oauth2.id_token
    google.oauth2.service_account