add requirement for numpydoc package

[prjemian]

these warnings now

[jemian@gov,240,docs]$ make clean html
rm -rf build/*
sphinx-build -b html -d build/doctrees   source build/html
Making output directory...
Running Sphinx v1.2.2
loading pickled environment... not yet created
loading intersphinx inventory from http://docs.python.org/objects.inv...
building [html]: targets for 22 source files that are out of date
updating environment: 22 added, 0 changed, 0 removed
reading sources... [100%] resources/tomopy.tools.fftw                                                                                                                                                                   
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.adaptive_segment'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.apply_padding'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.art'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.correct_drift'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.data_to_hdf5'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.data_to_tiff'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.dataset'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.diagnose_center'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.downsample2d'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.downsample3d'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.gridrec'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.median_filter'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.mlem'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.mlem_multilevel'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.normalize'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.optimize_center'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.phase_retrieval'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.read'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.recon_to_hdf5'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.recon_to_tiff'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.region_segment'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.remove_background'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.stripe_removal'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.threshold_segment'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.upsample2d'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.upsample3d'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.dataio.reader.rst:19: WARNING: toctree references unknown document u'resources/tomopy.dataio.reader.Session.zinger_removal'
/home/oxygen18/JEMIAN/Documents/eclipse/tomopy/docs/source/resources/tomopy.recon.gridrec.rst:19: WARNING: toctree references unknown document u'resources/tomopy.recon.gridrec.Gridrec.reconstruct'
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... done
writing output... [100%] resources/tomopy.tools.fftw                                                                                                                                                                    
None:None: WARNING: toctree contains reference to nonexisting document u'resources/tomopy.recon.gridrec.Gridrec.reconstruct'
None:None: WARNING: toctree contains reference to nonexisting document u'resources/tomopy.dataio.reader.Session.adaptive_segment'

[prjemian]

http://stackoverflow.com/questions/12206334/sphinx-autosummary-toctree-contains-reference-to-nonexisting-document-warnings

user1287170 describes how to silence these warnings

[prjemian]

done in 6ced7a6