def prepend_path(path)
      self.config = hash_reassoc(config, :paths) do |paths|
        path = File.expand_path(path, config[:root]).freeze
        paths.unshift(path)
      end
    end
def prepend_path(path)
      self.config = hash_reassoc(config, :paths) do |paths|
        path = File.expand_path(path, config[:root]).freeze
        paths.unshift(path)
      end
    end
Prepend a `path` to the `paths` list.

 Paths at the end of the `Array` have the least priority.