Astropy-helpers

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- Fixed incorrect/missing git hash being added to the generated ``version.py``
when creating a release. [141]

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- Fixed problems related to the automatically generated _compiler
module not being created properly. [139]

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- Fixed an issue where ah_bootstrap.py could blow up when astropy_helper's
version number is 1.0.

- Added a workaround for documentation of properties in the rare case
where the class's metaclass has a property of the same name. [130]

- Fixed an issue on Python 3 where importing a package using astropy-helper's
generated version.py module would crash when the current working directory
is an empty git repository. [114, 137]

- Fixed an issue where the "revision count" appended to .dev versions by
the generated version.py did not accurately reflect the revision count for
the package it belongs to, and could be invalid if the current working
directory is an unrelated git repository. [107, 137]

- Likewise, fixed a confusing warning message that could occur in the same
circumstances as the above issue. [121, 137]

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- More improvements for building the documentation using Python 3.x. [100]

- Additional minor fixes to Python 3 support. [115]

- Updates to support new test features in Astropy [92, 106]

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- The generated ``version.py`` file now preserves the git hash of installed
copies of the package as well as when building a source distribution. That
is, the git hash of the changeset that was installed/released is preserved.
[87]

- In smart resolver add resolution for class links when they exist in the
intersphinx inventory, but not the mapping of the current package
(e.g. when an affiliated package uses an astropy core class of which
"actual" and "documented" location differs) [88]

- Fixed a bug that could occur when running ``setup.py`` for the first time
in a repository that uses astropy-helpers as a submodule:
``AttributeError: 'NoneType' object has no attribute 'mkdtemp'`` [89]

- Fixed a bug where optional arguments to the ``doctest-skip`` Sphinx
directive were sometimes being left in the generated documentation output.
[90]

- Improved support for building the documentation using Python 3.x. [96]

- Avoid error message if .git directory is not present. [91]

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- Fixed some CSS issues in generated API docs. [69]

- Fixed the warning message that could be displayed when generating a
version number with some older versions of git. [77]

- Fixed automodsumm to work with new versions of Sphinx (>= 1.2.2). [80]