Gruntfile.js

'use strict';

module.exports = function(grunt) {

    grunt.initConfig({
      pkg: grunt.file.readJSON('package.json'),

      project: {
          app: ['app'],
          assets: ['<%= project.app %>/assets'],
          css: ['<%= project.assets %>/sass/style.scss']
      },
      sass: {
          dev: {
              options: {
                  style: 'expanded',
                  compass: false
              },
              files: {
                  '<%= project.assets %>/css/style.css':'<%= project.css %>'
              }
          }
      },
      watch: {
          sass: {
              files: '<%= project.assets %>/sass/{,*/}*.{scss,sass}',
              tasks: ['sass:dev']
          }
      }
    });

    grunt.loadNpmTasks('grunt-contrib-sass');
    grunt.loadNpmTasks('grunt-contrib-watch');

    grunt.registerTask('default', [
        'watch'
    ]);

};