Gulp is neato

gulpfile.js

'use strict';

var gulp = require('gulp'),
    less = require('gulp-less'),
    clean = require('gulp-clean'),
    coffee = require('gulp-coffee'),
    uglify = require('gulp-uglify'),
    concat = require('gulp-concat');

var paths = {
    styles: ['assets/styles/**/*.less'],
    scripts: ['assets/scripts/**/*.coffee']
};

// Clean up build/generated files
gulp.task('clean', function() {
    return gulp.src('build').pipe(clean());
});

// Compile all coffeescripts to javascript, minify and concatenate into a single
// file.
gulp.task('scripts', function() {
    return gulp.src(paths.scripts)
        .pipe(coffee())
        .pipe(uglify())
        .pipe(concat('hobo.min.js'))
        .pipe(gulp.dest('build/js'));
});

// Compile all less styles to CSS, minify and concatenate into a single file
gulp.task('styles', function() {
    return gulp.src(paths.styles)
        .pipe(less())
        .pipe(concat('hobo.min.css'))
        .pipe(gulp.dest('build/css'));
});

// Rebuild on change
gulp.task('watch', function() {
    gulp.watch(paths.scripts, ['scripts']);
    gulp.watch(paths.styles, ['styles']);
});

// Run the whole shebang
gulp.task('default', ['clean', 'scripts', 'styles', 'watch']);