gulpfile.js

var gulp = require("gulp");
var sass = require("gulp-sass");
var rename = require('gulp-rename');

gulp.task('sass', function () {
 return gulp.src(['./**/sass/*.scss', '!./node_modules/**/*', '!./m4/**/*'])
 .pipe(sass({
 outputStyle: 'nested',
 precision: 5,
 onError: function (err) {
 notify().write(err);
 }
 }))
 .pipe(rename(function (path) {
 path.dirname += "/../";
 }))
 .pipe(gulp.dest('./'))
});

gulp.task('default', ['sass']);