Pytest-config

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- Removed ``-p`` option of ``pytest_config.update`` in favor of automaticaly adding the
current directory to the ``PYTHONPATH`` before running test running.

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- Added some common-use fixtures.

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- Cleanup and organization for releasing to PyPI.
- Renamed ``pytest_config.django`` Django app to just ``pytest_config``.

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- Added ``--runslow`` option to run tests marked as slow tests.
- Added ``pytest-django`` as package requirement since this is meant to be used
within Django projects.
- ``pep8>=1.5.6`` as package requirement as this version supports more PEP8 rules.

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- Fixed bug when detecting parsing DJANGO_SETTINGS_MODULE and checking
availability of such.

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- Added support for lowercase ``django_settings_module`` ini value in pytest.ini.
- Added ``-y``, ``--overwrite`` to ``pytest_config.update`` that will make the script
automatically overwrite the user configurations with the defaults.
- Added ``-p``, ``--fix-path`` to only fix the pytest-django known issue.
- ``pretty._print_*`` is now ``pretty.print_*``.