EDITED - Gruntfile.js for making .zip file for WordPress theme

gistfile1.txt

'use strict';
module.exports = function(grunt){

    // load all tasks
    require('load-grunt-tasks')(grunt, {scope: 'devDependencies'});

    grunt.initConfig({
        pkg: grunt.file.readJSON('package.json'),
        makepot: {
            target: {
                options: {
                    domainPath: '/languages/',    // Where to save the POT file.
                    potFilename: '<%= pkg.name %>.pot',   // Name of the POT file.
                    type: 'wp-theme'  // Type of project (wp-plugin or wp-theme).
                }
            }
        },
        clean: {
            init: {
                src: ['build/']
            },
            build: {
                src: ['build/*', '!build/<%= pkg.name %>.zip']
            }
        },
        copy: {
            readme: {
                src: 'readme.md',
                dest: 'build/readme.txt'
            },
            build: {
                expand: true,
                src: ['**', '!node_modules/**', '!build/**', '!readme.md', '!Gruntfile.js', '!package.json' ],
                dest: 'build/'
            }
        },
        compress: {
            build: {
                options: {
                    archive: 'build/<%= pkg.name %>.zip'
                },
                expand: true,
                cwd: 'build/',
                src: ['**/*'],
                dest: '<%= pkg.name %>/'
            }
        }
    });

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

    // Build .pot file
    grunt.registerTask( 'buildpot', [
        'makepot'
    ]);

    // Build task
    grunt.registerTask( 'build', [ 
        'makepot',
        'clean:init', 
        'copy',
        'compress:build',
        'clean:build'
    ]);    
};