To update your theme replace
/unsupported directories in
~/Library/Application Support/Propane/ directory with those in this repo. Be sure to backup your original copies or they will be gone.
Note: I use CodeKit to compile the sass/compass however many other apps will work just as fine.
propaneplus branch is developed for the GitHub's custom version of PropaneApp. One of the many beautiful features you can play with, as a GitHubber.