Astropy-helpers

------------------

- Fixed compatibility with Sphinx 1.8+. [428]

- Fixed error that occurs when installing a package in an environment where
``numpy`` is not already installed. [404]

- Updated bundled version of sphinx-automodapi to v0.9. [422]

- Updated bundled version of numpydoc to v0.8.0. [423]

------------------

- Removing ez_setup.py file and requiring setuptools 1.0 or later. [384]

------------------

- Avoid deprecation warning due to ``exclude=`` keyword in ``setup.py``. [379]

------------------

- Fix segmentation faults that occurred when the astropy-helpers submodule
was first initialized in packages that also contained Cython code. [375]

------------------

- Support dotted package names as namespace packages in generate_version_py.
[370]

- Fix compatibility with setuptools 36.x and above. [372]

- Fix false negative in add_openmp_flags_if_available when measuring code
coverage with gcc. [374]

------------------

- Make sure that astropy-helpers 3.x.x is not downloaded on Python 2. [362, 363]

- The bundled version of sphinx-automodapi has been updated to v0.7. [365]

- Add --auto-use and --no-auto-use command-line flags to match the
``auto_use`` configuration option, and add an alias
``--use-system-astropy-helpers`` for ``--no-auto-use``. [366]