Docker for environment management

[pjbull]

We could add the option to have a Dockerfile in the project.

The issue that tracked this #13 didn't get much traction, but it is still worth considering.

Pros:

• Let's people have a docker env for their cookicutter project with everything wired up

Cons:

• People will have their own preferences on base images, but we'll have to have some versions we support
• Testing the Dockerfile will add overhead to our test runs and maintenance