Pytest-config

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- Refactored ``_print_color`` to make text coloring function ``colorize_text``
importable and reusable over apps using ``pytest_config``.

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- Added ``--fix-path-issues`` option to inspect the current django project and
check whether the project is available in the ``PYTHON_PATH`` for ``py.test``;
if not, add it to the pat by installing in via a simple ``setup.py`` file.
- Made ``pytest_config.init`` and ``pytest_config.update`` more verbose.

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- Added commands to initialize and interactively update the configuration files.
- Checking last version of configuration files before running the tests.
If no information of configuration files last version is available,
print an error message and terminate tests execution until this information
is available.
If the version seems outdated, print a warning suggesting the user to run
the updater command.

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- First release as having initial configurations.
- Caliendo-friendly command arguments available.