Improve fn publish command

[ucirello]

#351

Most likely funcfile struct can be trimmed down to fewer attributes.

[treeder]

I think fn publish should work something along these lines:

fn publish APP_NAME

• Recurse through all subdirectories
• If there is a func.yaml file or a Dockerfile, build the function and push it
• Update route with IronFunctions server. Route path being the route defined in the func.yaml file or the directory name. (should route be changed to path in func.yaml?). App name being APP_NAME.

[treeder]

Maybe we should change the name of this command too, since it's really only for bulk deploy.

[treeder]

Let's fork this example: https://github.com/bfirsh/serverless-docker-voting-app and get it working with IronFunctions, it's a good example for this exact thing.