Add features: CLI (subset only), Dockerfile and CWL file to the repo

[agstephens]

@huard @cehbrecht: we are working on a branch that will allow daops to be called as a command-line utility (for subset only) - for testing with the ESA Earth Observation Exploitation Platform Common Architecture (EOEPCA) framework. EOEPCA uses ADES (Application Deployment and Execution Service) to generate a WPS and allow applications to be deployed and run to it in the following way:

• A CWL file: describing the inputs, outputs and arguments of the application
• A Dockerfile: encapsulating the recipe for building a container to run the application (in our case, a daops/cli.py interface)

Are you happy for us to add these features to the master branch of daops? There should be no disruption to the existing components.

[cehbrecht]

@agstephens I'm happy with this :)

I think ouranos is only using clisops (@huard )

[huard]

Correct, no objection at all, and assume you don't need our approval to modify daops.

[agstephens]

Thanks @huard and @cehbrecht!

@alaniwi: we have the all-clear from our collaborators to merge your changes into the master branch.