Create basic Yii2 app with Composer in C9

$ php composer.phar create-project --prefer-dist --stability=dev yiisoft/yii2-app-basic basic
...
Installing yiisoft/yii2-app-basic (dev-master 914a6f76fea9233f25c1951b350fe844cd1bd177)
  - Installing yiisoft/yii2-app-basic (dev-master master)
    Downloading: 100%

Created project in basic
Loading composer repositories with package information
Installing dependencies (including require-dev)
  - Installing ezyang/htmlpurifier (v4.6.0)
    Downloading: 100%

  - Installing swiftmailer/swiftmailer (dev-master 46d55ba)
    Downloading: 100%

  - Installing yiisoft/jquery (2.1.1)
    Downloading: 100%

  - Installing yiisoft/jquery-pjax (dev-master 520f8c1)
    Downloading: 100%

  - Installing cebe/markdown (0.9.x-dev 6a3c373)
    Downloading: 100%

  - Installing yiisoft/yii2-composer (dev-master 139c452)
    Downloading: 100%

  - Installing phpspec/php-diff (dev-master 30e103d)
    Downloading: 100%

  - Installing yiisoft/yii2 (dev-master 2c98c9d)
    Downloading: 100%

  - Installing yiisoft/yii2-swiftmailer (dev-master ca6cfbd)
    Downloading: 100%

  - Installing yiisoft/yii2-codeception (dev-master 979101c)
    Downloading: 100%

  - Installing twbs/bootstrap (dev-master 5c11632)
    Downloading: 100%

  - Installing yiisoft/yii2-bootstrap (dev-master 86e22d9)
    Downloading: 100%

  - Installing yiisoft/yii2-debug (dev-master 1d0d2a0)
    Downloading: 100%

  - Installing yiisoft/yii2-gii (dev-master 3bdd568)
    Downloading: 100%

Writing lock file
Generating autoload files
Setting writable: runtime ...done
Setting writable: web/assets ...done
Setting executable: yii ...done