Add docker support

[liadmagen]

Add a dockerfile to the repository, using gunicorn as the flask server initializer.
Add to the README.md file instructions how to setup and have the engine running with minimal effort

[liadmagen]

This might not be SO easy task without previous knowledge, but a good practice for new comers of how to create a docker that supports machine learning on python.
There are already good base dockerfiles that include Numpy/pandas and such (i.e. anaconda miniconda based docker base)