v1.14

• Simplified pytest configuration in some cases.
• Fixed bumpversion configuration to not replace every matching string
  (like dependency pins).
• Changed travis configuration to install latest PyPy (6.0)
• Added an env for PyPy3 in Tox/Travis configuration.
• Dropped Python 3.3 support. Contributed by Labrys of Knossos in
  #97.
• Added Python 3.7 support.
• Made documentation optional (the new sphinx_docs option).
• Changed setup.py to avoid leaving unclosed file handles.
• Now using pytest instead of py.test. Contributed by Ville Skyttä
  in #92.
• Added mypy and pytest caches to .gitignore. Contributed by Nate
  Marks and Labrys of Knossos in
  #99 and
  #95
• Added support for generating a CFFI binding project.
• Fixed ci/bootstrap.py to work properly when mixing up Python 2 and
  3 (execv instead of broken activate_this.py).
• Various template fixes (spacing, conditions, etc).