Implement new python and NumPy version policy

Yury Matveevrequested to merge
527-python-and-numpy-version-policy into develop

Closes #527 (closed)

  • fixed python_requires in setup.py
  • added version policy page to the docs
  • added comment in how to contribute
  • removed trollius

Does somebody know any automated way to test which code is outdated?

Edited by Yury Matveev

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