copy Procfile to /dist/;
ensure to only apply build revisioning to files and NOT directories;

there is a fork of the 'grunt-rev' library which implements the check

https://github.com/FreakTheMighty/grunt-rev/commit/1e0c202a5fc987e7fada8518c26c637f06aae217
how to run live (on heroku)
how to stage; corrected public path; copy 'envs/staging.env' -> 'dist/.env'; 

 - specified '/public' path, similar to dev environment
 - usemin: ensure file;