Template for a Middleman site (Ruby 2.3.1 + Bundler + Middleman 4.1.10).
Install dependencies with bundle install.
Create a site from the template with middleman init site --template=kytkemo/middleman-site.
Start server with bundle exec middleman. The site will deploy to http://localhost:4567.
Build site with bundle exec middleman build. The output will be in build/.