Cpac-py

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* 📚 Update the main usage string to better articulate functionality
* 📢🐳 Provide a clearer error message if package cannot connect to Docker.
* 🐳 Fix a bug introduced in `v0.2.4 <https://github.com/shnizzedy/cpac-python-package/releases/tag/v0.2.4>` where some crashfiles would print for ``cpac --platform singularity crash`` but not for ``cpac --platform docker crash``
* 🚑 Fix some installation issues:
* All required packages are now installed with ``pip install cpac-py``
* Version is now set correctly
* 🐳 Fix a bug introduced in `v0.2.4 <https://github.com/shnizzedy/cpac-python-package/releases/tag/v0.2.4>`_ where some crashfiles would print for ``cpac --platform singularity crash`` but not for ``cpac --platform docker crash``
* 🔬 Set `coverage reports <http://coveralls.io/github/shnizzedy/cpac-python-package>`_ to report local paths

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* 💪 Make ``crash`` command automatically touch (within a container) all missing files a crashfile requires to exist and print the underlying output
* 🐳 Make Docker commands (especially ``pull`` and ``crash``) more robust
* ⬆️ Require Python ≥3.6 (for fstrings)

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* ✨ Added ``group`` and ``crash`` commands
* 🚑 Fixed a bug where pass-through flags were being mangled
* 🖇️ Binds any directories necessary to access any paths found in pass-through CLI arguments

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* 🖉 Pass ``run -h`` through like ``run --help``

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* ✨ Automatic binding of necessary local directories to Docker or Singularity
* 📚 Pass ``run --help`` through to container without positional arguments to get full current helpstring

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* Ⓢ Enabled specifying Singularity image file or Docker tag for Singularity