Gruntfile.js

/**
 * Grunt allow to compile scss files to css files each time
 * they are modified. This is a (faster) alternative to sass compiler.
 *
 * We configure compilation here : files scss to watch, output style.
 */
module.exports = function(grunt) {
  grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),

    sass: {
      options: {
        includePaths: ['bower_components/foundation/scss', '/sites/default/files/okcdesign/okcdesign']
      },
      dist: {
        options: {
          outputStyle: 'compressed'
        },
        files: {
          'css/app.css': 'scss/app.scss'
        }        
      }
    },

    watch: {
      grunt: { files: ['Gruntfile.js'] },

      sass: {
        files: 'scss/**/*.scss',
        tasks: ['sass']
      }
    }
  });

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

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