Cpac-py

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* ✨Ⓢ Added Singularity support

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* ⬆ Added installation depenencies

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* 🚑 Removed erroneous import statement

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* ➕ Require ``docker-pycreds``, ``websocket-client``

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* 🚑 Fixed bug preventing binding the same local directory to multiple Docker directories

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* ✨ Added support for ``pip install``
* ✨ Added support for ``cpac run``
* ✨ Added support for ``cpac utils``
* 🔊🐳 Routed live Docker logging to stdout
* 🔬 Added tests for ``cpac run`` and ``cpac utils``