use Sass 3.3.0.alpha.149 and Compass 0.12.2

Gruntfile.coffee

module.exports = (grunt) ->
  grunt.initConfig(
    uglify:
      dist:
        options: 
          mangle: false
        files:
          'script.min.js': ['js/*.js']

    coffee:
      dist:
        options: 
          bare: true
        files: 
          'js/final.js': ['coffee/*.coffee']
      tasks: ['coffeelint']

    coffeelint: 
      options: 
        force: true
        indentation:
          value: 4
          level: 'error'
      app: ['coffee/*.coffee']
      
    sass: 
      options:
        compass: true
        style: 'compressed'
      release: 
        files: 
          'style.min.css': 'sass/style.scss'  
      dev: 
        options:
          sourcemap: true
          style: 'expanded'
        files: 
          'style.min.css': 'sass/style.scss'
    
    clean: 
      options:
        force: true
      dist: '*.map'
      
    watch: 
      html: 
        files: '*.html'
      css: 
        files: 'sass/*.scss'
        tasks: ['sass:dev']
      coffee: 
        files: ['coffee/*.coffee']
        tasks: ['coffeelint', 'coffee']
      js: 
        files: ['js/*.js']
        tasks: ['uglify']
      livereload: 
        options: 
          livereload: true
        files: ['*.js', '*.css', '*.html']


  )


  # grunt.loadTasks('tasks')
  grunt.loadNpmTasks 'grunt-contrib-uglify'
  grunt.loadNpmTasks 'grunt-contrib-sass'
  grunt.loadNpmTasks 'grunt-contrib-compass'
  grunt.loadNpmTasks 'grunt-contrib-watch'
  grunt.loadNpmTasks 'grunt-contrib-coffee'
  grunt.loadNpmTasks 'grunt-coffeelint'
  grunt.loadNpmTasks 'grunt-contrib-clean'


  grunt.registerTask('default', [
    'coffee',
    'uglify',
    'sass:release'
  ])
  grunt.registerTask('dev', ['watch'])