The default output of SASS .sass_cache directory is in the Middleman app root directory, which to my mind adds clutter to the directory.
Secondly, when storing Middleman apps in a Dropbox subfolder, the .sass_cache directory gets synced unnecessarily.
This fix enables moving the .sass_cache directory to any path on the system, such as the "/tmp" directory for automatic discarding of files when restarting the system.
Suggested usage:
#in config.rb
set :sass_cache_path, File.join('/tmp', "middleman-#{File.basename(Dir.pwd)}", "sass_cache")
which could return something like:
`/tmp/middleman-example.com/sass_cache`
This keeps multiple projects separated and easily identifiable.