Remove documentation about non-package data files that's no longer relevant without eggs. Fixes #1385.

Drop support for EOL Python 3.3

Add reference to Setuptools Developers team for clarity of maintenance and removed reference to Jason as maintainer.

Make minor fixes to release docs

Bump appveyor Python 3 to 3.6

Allow setting long_description_content_type externally

Feature/issue 1330

Update release process docs

Don't require network in tests

Stop testing Python 3.3 in Travis

Use canonicalize_name to look for .dist-info in wheel files

Add tests for PEP 425 support

Fix attr: with package_dirs

Tests in test_egg_info no longer invoke 'setup.py install', but instead focus on the behavior in egg_info as the namesake suggests.

Some tools, such as PBR, might want to set
long_description_content_type during the parent object's
Distribution.__init__() call (during distutils setup_keywords entry
points).  However, that field is currently unconditionally overwritten
after these calls, erasing the value.

We would rather not duplicate the existing method of copying into
dist.metadata as done with project_urls.

This preserves the fields within Distribution.metadata described by
self._DISTUTIULS_UNUPPORTED_METADATA, or otherwise takes it from
arguments.

A test case that simulates setting the long description and overriding
the arguments is added.

Generate doc previews for pull requests

Fixes issue #1350

Support loading version from a file

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