title: gulp-compass error "You need to have Ruby and Compass installed and in your system PATH"
body: <p>I'm using <a href="https://www.npmjs.org/package/gulp-compass" rel="nofollow">gulp-compass</a> to compile my <code>scss</code> to <code>css</code> using gulp task. I'm running on Windows 7.<br>
  My Gulp task:</p>
  
  <pre><code>gulp.task('styles', function() {
        gulp.src('./sass/design.scss')
      .pipe(compass({
        config_file: './config.rb',
        css: 'stylesheets',
        sass: 'sass',
        require: ['susy', 'breakpoint']
      }))
      .pipe(gulp.dest('dest/css'));
  });
  </code></pre>
  
  <p>I get the following error message:</p>
  
  <pre><code>Error: You need to have Ruby and Compass installed and in your system PATH for this task to work.
  </code></pre>
  
  <p>I have Ruby and Compass installed and in my system PATH so I can't see what's the problem.<br>
  I tried re-installing both Ruby and Compass and it didn't help either.</p>
  
  <p>When I tried to use the same task on a Mac system it worked fine.</p>
  
  <p>Replacing the <code>gulp-compass</code> plugin to <a href="https://www.npmjs.org/package/gulp-ruby-sass" rel="nofollow">gulp-ruby-sass</a> is not an option due to a bug they have which block me from using certain sass features I need to use.</p>