[docs] More documentation rewriting.

docs/extension/django.rst

@@ -0,0 +1,53 @@
+Working with Django
+===================
+
+|bonobo| provides a lightweight integration with django, to allow to write management commands using |bonobo| graphs.
+
+Management Command
+::::::::::::::::::
+
+To write a management command with |bonobo|, just extend the :class:`bonobo.contrib.django.ETLCommand` class and
+override the `get_graph()` method.
+
+Example:
+
+.. code-block:: python
+
+    import bonobo
+    from bonobo.contrib.django import ETLCommand
+
+    class Command(ETLCommand):
+        def get_graph(self, **options):
+            graph = bonobo.Graph()
+            graph.add_chain(...)
+            return graph
+
+You can also override the `get_services()` method.
+
+One common recipe to do so is to import it from somewhere else and override it as a :obj:`staticmethod`:
+
+.. code-block:: python
+
+    import bonobo
+    from bonobo.contrib.django import ETLCommand
+
+    from myproject.services import get_services
+
+    class Command(ETLCommand):
+        get_services = staticmethod(get_services)
+
+        def get_graph(...):
+            ...
+
+Source code
+:::::::::::
+
+https://github.com/python-bonobo/bonobo/tree/master/bonobo/contrib/django
+
+Reference
+:::::::::
+
+.. automodule:: bonobo.contrib.django
+    :members:
+    :undoc-members:
+    :show-inheritance: