Importlib-metadata

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* Fixed ``repr(EntryPoint)`` on PyPy 3 also. Closes 102.

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* Dropped support for Python 3.4.
* EntryPoints are now pickleable. Closes 96.
* Fixed ``repr(EntryPoint)`` on PyPy 2. Closes 97.

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* Project adopts semver for versioning.

* Removed compatibility shim introduced in 0.23.

* For better compatibility with the stdlib implementation and to
avoid the same distributions being discovered by the stdlib and
backport implementations, the backport now disables the
stdlib DistributionFinder during initialization (import time).
Closes 91 and closes 100.

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* Added a compatibility shim to prevent failures on beta releases
of Python before the signature changed to accept the
"context" parameter on find_distributions. This workaround
will have a limited lifespan, not to extend beyond release of
Python 3.8 final.

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* Renamed ``package`` parameter to ``distribution_name``
as `recommended <https://bugs.python.org/issue34632#msg349423>`_
in the following functions: ``distribution``, ``metadata``,
``version``, ``files``, and ``requires``. This
backward-incompatible change is expected to have little impact
as these functions are assumed to be primarily used with
positional parameters.

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* ``importlib.metadata`` now exposes the ``DistributionFinder``
metaclass and references it in the docs for extending the
search algorithm.
* Add ``Distribution.at`` for constructing a Distribution object
from a known metadata directory on the file system. Closes 80.
* Distribution finders now receive a context object that
supplies ``.path`` and ``.name`` properties. This change
introduces a fundamental backward incompatibility for
any projects implementing a ``find_distributions`` method
on a ``MetaPathFinder``. This new layer of abstraction
allows this context to be supplied directly or constructed
on demand and opens the opportunity for a
``find_distributions`` method to solicit additional
context from the caller. Closes 85.