include copy of django_extension, dont install django from git

contrib/django_extensions/docs/graph_models.rst

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+Graph models
+============
+
+:synopsis: Renders a graphical overview of your project or specified apps.
+
+Creates a GraphViz_ dot file for the specified app names based on their models.py.
+You can pass multiple app names and they will all be combined into a single model.
+Output is usually directed to a dot file.
+
+There several options available like: grouping models, including inheritance,
+excluding models and columns and changing the layout when rendering to an output
+image.
+
+With the latest revisions it's also possible to specify an output file if
+pygraphviz_ is installed and render directly to an image or other supported
+file-type.
+
+
+Selecting a library
+-------------------
+
+You need to select the library to generate the image, you can do so by passing
+the --pygraphviz or --pydot parameters depending on the library you want to use.
+
+When neither of the command line parameters are given the default is to try and load
+pygraphviz or pydot (in that order) to generate the image.
+
+To install pygraphviz you usually need to run this command:
+
+::
+  $ pip install pygraphviz
+
+It is possible you can't install it because it needs some C extensions to build, you
+can try other methods to install or you can use PyDot.
+
+To install pydot you need to run this command:
+
+::
+  $ pip install pyparsing==1.5.7
+  $ pip install pydot
+
+Installation should be fast and easy, remember to install this exact version of
+pyparsing, otherwise it's possible you get this error:
+
+    Couldn't import dot_parser, loading of dot files will not be possible.
+
+
+Default Settings
+----------------
+
+The option GRAPH_MODELS = {} can be used in the settings file to specify default options::
+
+  GRAPH_MODELS = {
+    'all_applications': True,
+    'group_models': True,
+  }
+
+It uses the same names as on the command line only with the leading two dashes removed and
+the other dashes replaced by underscores.
+
+
+Example Usage
+-------------
+
+With *django-extensions* installed you can create a dot-file or an
+image by using the *graph_models* command. Like used in the following examples::
+
+  # Create a dot file
+  $ ./manage.py graph_models -a > my_project.dot
+
+::
+
+  # Create a PNG image file called my_project_visualized.png with application grouping
+  $ ./manage.py graph_models -a -g -o my_project_visualized.png
+
+  # Same example but with explicitly selecting pygraphviz or pydot
+  $ ./manage.py graph_models --pygraphviz -a -g -o my_project_visualized.png
+  $ ./manage.py graph_models --pydot -a -g -o my_project_visualized.png
+
+::
+
+  # Create a dot file for only the 'foo' and 'bar' applications of your project
+  $ ./manage.py graph_models foo bar > my_project.dot
+
+
+.. _GraphViz: http://www.graphviz.org/
+.. _pygraphviz: https://networkx.lanl.gov/wiki/pygraphviz
+.. _pydot: https://pypi.python.org/pypi/pydot