Grunt CSS processing

Gruntfile.js

module.exports = function(grunt)
{
    grunt.initConfig(
    {
        pkg: grunt.file.readJSON('package.json'),

        watch: {
            css: {
                files: ['www/src/sass/**/*.scss'],
                tasks: ['css']
            }
        },

        sass: {
            dist: {
                files: { 'www/dist/css/styles.css': 'www/src/sass/styles.scss' }
            }
        },

        autoprefixer: {
            dist: {
                files: { 'www/dist/css/styles.css': 'www/dist/css/styles.css' }
            }
        },

        cmq: {
            dist: {
                files: { 'www/dist/css': ['www/dist/css/styles.css'] }
            }
        },

        imagemin: {
            png: {
                options: { optimizationLevel: 7 },
                files: [
                {
                    expand: true,
                    src: 'www/src/assets/gfx/**/*.png'
                }]
            },
            jpg: {
                options: { progressive: true },
                files: [
                {
                    expand: true,
                    src: 'www/src/assets/gfx/**/*.{jpg,jpeg}'
                }]
            },
            gif: {
                options: { interlaced: false },
                files: [
                {
                    expand: true,
                    src: 'www/src/assets/gfx/**/*.gif'
                }]
            }
        },

        imageEmbed: {
            dist: {
                src: ['www/dist/css/styles.css'],
                dest: 'www/dist/css/styles.css',
                options: {
                    baseDir: 'www',
                    deleteAfterEncoding: false
                }
            }
        },

        cssmin: {
            options: { report: 'gzip' },
            dist: {
                files: { 'www/dist/css/styles.css': ['www/dist/css/styles.css'] }
            }
        }
    });

    grunt.loadNpmTasks('grunt-contrib-watch');
    grunt.loadNpmTasks('grunt-sass');
    grunt.loadNpmTasks('grunt-autoprefixer');
    grunt.loadNpmTasks('grunt-combine-media-queries');
    grunt.loadNpmTasks('grunt-contrib-imagemin');
    grunt.loadNpmTasks('grunt-image-embed');
    grunt.loadNpmTasks('grunt-contrib-cssmin');

    grunt.registerTask('default', ['watch']);
    grunt.registerTask('css', ['sass', 'autoprefixer', 'cmq', 'imagemin', 'imageEmbed', 'cssmin']);
};