Gulp-compass compressing sass not working

Running **Sass 3.4.3**, **Compass 1.0.1**, **Gulp 3.8.8** and **Gulp-compass 1.3.1**

```
var gulp = require('gulp');
var compass = require('gulp-compass');
var gutil = require('gulp-util');

gulp.task('compass', function() {
gulp.src('comp/sass/style.scss')
.pipe(compass({
sass: 'comp/sass',
image: 'dev/theme/images',
style: 'compressed'
})
.on('error', gutil.log))
.pipe(gulp.dest('dev/theme/css'))
});
```

compass Task is compiling the sass but compression is not working. It output a normal uncompressed css file.

Start with the reported Gulp task and reproduce the output using Sass 3.4.3, Compass 1.0.1, Gulp 3.8.8, and gulp-compass 1.3.1. Inspect how the `style: 'compressed'` option is handled, then verify that the generated CSS in `dev/theme/css` is compressed rather than normal uncompressed CSS.

Written by the indexing model from the issue text.