Usage - zip a folder to current path

    var Q = require('q');
    var zip = require('zipfolder');

    // test-folder/ => test-folder.zip
    zip.zipFolder({folderPath: 'test-folder'}, function (err, path) {
       if (err) {
           console.log(err);
       } else {
           console.log(path);
       }
    });

Usage - zip a folder to other path

    // test-folder/ => output-folder/test-folder.zip
    zip.zipFolder({folderPath: 'test-folder', targetFolderPath: 'output-folder'}, function (err, path) {
        if (err) {
            console.log(err);
        } else {
            console.log(path);
        }
    });

Usage - use Q promise

    // use Q promise
    zip.zipFolder({folderPath: 'test-folder', targetFolderPath: 'output-folder'})
        .then(function (path) {
            console.log(path);
        }, function (err) {
            console.log(err);
        });