参考文档：http://docs.coding.io/languages/php

官方通过composer.json来配置PHP环境，例如：

{
    "require": {"php": "5.5.16"}
}

OK，这个没有问题，我也部署成功了。现在我要使用一个第三方开发包：https://packagist.org/packages/levi/lv，修改composer.json如下：

{
    "require" : {
        "php": "5.6.3",
        "levi/lv" : "dev-master",
        "ext-redis" : "*"
    }
}

就部署不成功了，错误提示如下：

2015-02-08T18:20:55.67+0800 [API]     OUT Updated app with guid d645cb8f-2ec6-404f-89e7-0795b8ede261 ({"state"=>"STOPPED"})
2015-02-08T18:22:23.10+0800 [DEA]     OUT Got staging request for app with id d645cb8f-2ec6-404f-89e7-0795b8ede261
2015-02-08T18:20:57.88+0800 [API]     OUT Updated app with guid d645cb8f-2ec6-404f-89e7-0795b8ede261 ({"state"=>"STARTED"})
2015-02-08T18:22:25.12+0800 [STG]     OUT -----> Downloaded app package (8.0K)
2015-02-08T18:22:25.31+0800 [STG]     OUT -------> Buildpack version 1.0.2
2015-02-08T18:22:25.48+0800 [STG]     OUT  !     ERROR:        Your composer.json specifies dependencies, but no composer.lock
2015-02-08T18:22:25.48+0800 [STG]     OUT        was found, please check it into your repository along with composer.json!
2015-02-08T18:22:25.48+0800 [STG]     OUT Staging failed: Buildpack compilation step failed
2015-02-08T18:20:58.56+0800 [API]     ERR Encountered error: Staging error: failed to stage application:
2015-02-08T18:20:58.56+0800 [API]     ERR Script exited with status 1

我看官方文档有段说明是这样的：

构建

系统会运行以下命令来解决依赖：

install --no-dev --prefer-dist --optimize-autoloader --no-interaction

好像是在部署的时候，默认就不执行安装开发包，那么请问如何在coding中安装一个第三方开发包呢？