Adds some tests for the OAuth and some docs

docs/source/api/oauth.rst

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+.. MediaGoblin Documentation
+
+   Written in 2011, 2012 by MediaGoblin contributors
+
+   To the extent possible under law, the author(s) have dedicated all
+   copyright and related and neighboring rights to this software to
+   the public domain worldwide. This software is distributed without
+   any warranty.
+
+   You should have received a copy of the CC0 Public Domain
+   Dedication along with this software. If not, see
+   <http://creativecommons.org/publicdomain/zero/1.0/>.
+
+==============
+Authentication
+==============
+
+GNU MediaGoblin uses OAuth1 to authenticate requests to the API. There are many
+libraries out there for OAuth1, you're likely not going to have to do much. There
+is a library for the GNU MediaGoblin called `PyPump <https://github.com/xray7224/PyPump>`_.
+We are not using OAuth2 as we want to stay completely compatable with GNU MediaGoblin.
+
+
+We use :doc:`client_register` to get the client ID and secret.
+
+Endpoints
+---------
+
+These are the endpoints you need to use for the oauth requests:
+
+`/oauth/request_token` is for getting the request token.
+
+`/oauth/authorize` is to send the user to to authorize your application.
+
+`/oauth/access_token` is for getting the access token to use in requests.
+