When assigning a css directory, the gulp.dest folder get's ignored.

Hello,

I can't seem to use the gulp.dest folder after I used the compas command.
I noticed, when I leave the css folder out, the gulp dest folder still get's ignored. But then
a css folder gets created in the same folder as the gulpfile.js.

What do I need to change to make the gulp.dest work? Because the .pipe(minifyCSS()) methods
does nothing because the compass does not return the streaming data.

```
var gulp = require('gulp'),
gutil = require('gulp-util'),
browserify = require('gulp-browserify'),
compass = require('gulp-compass'),
minifyCSS = require('gulp-minify-css'),
path = require('path');
concat = require('gulp-concat');

gulp.task('log', function() {
gutil.log('Start Gulp logging..');
});

gulp.task('compass', function() {
gulp.src('*.scss')
.pipe(compass({
sass: '../../import/app/styles', //the location where the sass files are
css : '../../public_html/main/styles/css/', //css destination
style: 'expanded'
}))
.on('error', gutil.log)
.pipe(minifyCSS())
.pipe(gulp.dest('../../public_html/main/styles/css/'));
});
```

Start with the gulpfile.js compass task and inspect how gulp-compass handles the stream before the minifyCSS and gulp.dest steps. Reproduce the task with the shown paths and check whether Compass returns streaming data; done means the compiled CSS reaches minifyCSS and is written to the configured gulp.dest folder.

Written by the indexing model from the issue text.