Compass is great, but sometimes we need to have common framework code in one (global) location with local overrides in the app.
This addition adds built-in support for loading SASS/SCSS files from multiple locations external to the "source" directory and even the Middleman app root.
Example usage:
# in config.rb
set :sass_assets_path, [ "#{root}/assets/sass/", "~/.sass-repo/"]
Using symlinks or copying files to the Middleman project can get messy quickly. This fix reduces some of those issues.