gnu: Add python-ipywidgets. * gnu/packages/python.scm (python-ipywidgets, python2-ipywidgets): New variables.
gnu: Add python-widgetsnbextension. * gnu/packages/python.scm (python-widgetsnbextension, python2-widgetsnbextension): New variables.
gnu: Add python-notebook. * gnu/packages/python.scm (python-notebook, python2-notebook): New variables.
gnu: Add python-nbconvert. * gnu/packages/python.scm (python-nbconvert, python2-nbconvert): New variables.
gnu: Add python-entrypoints. * gnu/packages/python.scm (python-entrypoints, python2-entrypoints): New variables.
gnu: Add python-bleach. * gnu/packages/python.scm (python-bleach, python2-bleach): New variables.
gnu: Add python-nbformat. * gnu/packages/python.scm (python-nbformat, python2-nbformat): New variables.
gnu: Add python-html5lib-0.9. * gnu/packages/python.scm (python-html5lib-0.9, python2-html5lib-0.9): New variables.
gnu: Add python-testpath. * gnu/packages/python.scm (python-testpath, python2-testpath): New variables.
gnu: Add python-ipykernel. * gnu/packages/python.scm (python-ipykernel, python2-ipykernel): New variables.
gnu: Add python-jupyter-client. * gnu/packages/python.scm (python-jupyter-client, python2-jupyter-client): New variables.
gnu: Add python-jupyter-core. * gnu/packages/python.scm (python-jupyter-core, python2-jupyter-core): New variables.
gnu: python-traitlets: Update to 4.2.0. * gnu/packages/python.scm (python-traitlets): Update to 4.2.0.
gnu: Add python-imagesize. * gnu/packages/python.scm (python-imagesize, python2-imagesize): New variables. Signed-off-by: Leo Famulari <leo@famulari.name>
gnu: python-waf: Download over https. * gnu/packages/python.scm (python-waf)[source]: Use https.
gnu: python-nltk: Disable the test suite. The tests were silently skipped with Python 3.4. With Python 3.5, this caused the build of python-nltk to fail. * gnu/packages/python.scm (python-nltk, python2-nltk)[arguments]: Disable the tests.
gnu: python-pyquery: Add inputs for test suite. * gnu/packages/python.scm (python-pyquery, python2-pyquery)[native-inputs]: Add python-webob and python-webtest.
gnu: python-pika: Add inputs for test suite. * gnu/packages/python.scm (python-pika, python2-pika)[native-inputs]: Add python-pyev, python-tornado.
gnu: Add python-pyev. * gnu/packages/python.scm (python-pyev, python2-pyev): New variables.
gnu: python-prompt-toolkit: Disable the test suite. The tests were silently skipped with Python 3.4. With Python 3.5, this caused the build of python-prompt-toolkit to fail. * gnu/packages/python.scm (python-prompt-toolkit, python2-prompt-toolkit)[arguments]: Disable the tests.