[ENH] Sphinx extension to plot workflows

Close #1873

Author: oesteban

doc/conf.py

@@ -52,6 +52,7 @@
               'numpy_ext.numpydoc',
               'matplotlib.sphinxext.plot_directive',
               'matplotlib.sphinxext.only_directives',
+              'nipype.sphinxext.plot_workflow',
               #'IPython.sphinxext.ipython_directive',
               #'IPython.sphinxext.ipython_console_highlighting'
               ]

nipype/sphinxext/__init__.py

@@ -0,0 +1,5 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
+# vi: set ft=python sts=4 ts=4 sw=4 et:
+from __future__ import print_function, division, absolute_import, unicode_literals