Log Message:
www/ruby-sass-listen: add version 4.0.0 package

This fork of guard/listen provides a stable API for users of the ruby Sass CLI.

Listen

The Listen gem listens to file modifications and notifies you about the changes.

Features

* OS-optimized adapters on MRI for Mac OS X 10.6+, Linux, \*BSD and Windows,
  [more info](#listen-adapters) below.
* Detects file modification, addition and removal.
* You can watch multiple directories.
* Regexp-patterns for ignoring paths for more accuracy and speed
* Increased change detection accuracy on OS X HFS and VFAT volumes.
* Tested on MRI Ruby environments (2.0+ only) via
  [Travis CI](https://travis-ci.org/guard/listen).