Easygv

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* tests more robust
* Makefile: docs -> dont run apidoc as command
* add_edges now supports edge labels and classes
* easygv: added and improved docstrings
* supports clusters
* load_graph_input: now recodes NaNs to ""
* configure flake8 ignores ignore flake8 D301 in certain functions flake8 ignore all E501, D413
* easygv.cli: removed unused imports
* inform that we only support py34 to py36
* Fleshed out usage.rst

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* docs/index.rst fixed title warning
* delete cli.draw
* add sphinx_rtd_theme as dev dep
* tox.ini removed py2k added py36
* first minimally functional commit
* docs/conf.py set run_apidoc module_path
* ran travis_pypi_setup.py
* ignore tmp/

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* Initial commits.