add requirements in demo, update doc

demo/requirements.pip

@@ -0,0 +1,3 @@
+django==1.7
+django-rest-auth==0.3.0
+django-allauth==0.18.0

docs/demo.rst

@@ -0,0 +1,15 @@
+Demo project
+============
+
+To run demo project (ideally in virtualenv):
+
+.. code-block:: python
+
+    cd /tmp
+    git clone git@github.com:Tivix/django-rest-auth.git
+    cd django-rest-auth/demo/
+    pip install -r requirements.pip
+    python manage.py syncdb --settings=demo.settings --noinput
+    python manage.py runserver --settings=demo.settings
+
+Now, go to ``http://127.0.0.1:8000/`` in your browser.

docs/index.rst

@@ -21,6 +21,7 @@ Contents
    Installation <installation>
    API endpoints <api_endpoints>
    Configuration <configuration>
+   Demo project <demo>
    Changelog <changelog>