Setupmeta

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* Corrected bug: parsing ``PKG-INFO`` files properly

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* Added ``requirements_from_text()`` and ``requirements_from_file()``

* Use a regex to determine simple pins of the form ``foo==1.0``

* Consistently apply auto-abstraction to ``tests_require`` as well

* Internally use consistent names for ``install_requires``, ``tests_require`` and ``extras_require``

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* Do not use ``pip`` anymore to parse ``requirements.txt`` (49)

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* Added command ``uber_egg``, to support creating spark_-like "uber eggs"

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* Corrected warning when hardcoded version found does not match git tag

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* Auto-fill ``include_package_data`` when ``MANIFEST.in`` is present