Pytest-rerunfailures

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- Prepare CLI options to pytest 3.0, to avoid a deprecation warning.

- Fix error due to missing CHANGES.rst when creating the source distribution
by adding a MANIFEST.in.

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- Drop support for Python 3.2, since supporting it became too much of a hassle.
(Reason: Virtualenv 14+ / PIP 8+ do not support Python 3.2 anymore.)

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- Add support for ``--resultlog`` option by parsing reruns accordingly. (28)

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- Improve package description and include CHANGELOG into description.

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- Rewrite to use newer API of pytest >= 2.3.0

- Improve support for pytest-xdist by only logging the final result.
(Logging intermediate results will finish the test rather rerunning it.)