To set up middleman locally on Fedora:
dnf install ruby rubygems rubygem-bundler rubygem-json
In the git checkout, do a bundle install. This installs all
the needed modules in their appropriate versions.
Add the middleman binary location (probably ~/bin) to $PATH.
To run a local web server to test the site:
bundle exec middleman server
Edit the haml/scss files and commit your changes, pushing to origin/source.
Pushing new commits automatically causes to trigger new build
and deployment on OpenShift. It usually takes few minutes for
changes to become visible. Files used for build can be found
in oscp directory.