Add a docker flag to "new"

[tlugger]

It would be nice to run a project in docker using a flag with nio new.

This command would need to clone from the nio-docker repo, copy a nio binary .whl file into the repo, make a specified proeject the "default_project" for that repo, and change the Dockerfile to expose the correct NIOPORT (8181 by default, 8182 for demo_plant).

A check should also be done to confirm that the docker daemon exists and can be run in the environment where the command was used.