Added documentation on numpydoc

Author: NelleV

doc/conf.py

@@ -34,6 +34,13 @@
               'numpy_ext.numpydoc']
 
 
+try:
+    import numpydoc
+except ImportError:
+    raise ImportError("No modyle named numpydoc - you need to install "
+                      "numpydoc to build the documentation.")
+
+
 autosummary_generate = True
 
 if sphinx.__version__ >= 1.1:

doc/devel/documenting_mpl.rst

@@ -7,9 +7,9 @@ Documenting matplotlib
 Getting started
 ===============
 
-The documentation for matplotlib is generated from ReStructured Text
-using the Sphinx_ documentation generation tool. Sphinx-1.0 or later
-is required.
+The documentation for matplotlib is generated from ReStructured Text using the
+Sphinx_ documentation generation tool. Sphinx-1.0 or later and numpydoc 0.4 or
+later is required.
 
 The documentation sources are found in the :file:`doc/` directory in
 the trunk.  To build the users guide in html format, cd into