20151228 麻浩男 添加自定义component后添加路径引用声明
修改文件列表：
    Yii2/base/Application.php
    Yii2/web/Application.php
修改详细描述：
    在类上方修改或添加component声明
    Yii2/base/Application.php
    修改@property \framework\client\web\AssetManager $assetManager The asset manager application component. This property is read-only.
    修改@property \yii\redis\Cache $cache The cache application component. Null if the component is not enabled.
    修改@property View|\framework\client\web\View $view The view application component that is used to render various view files. This property is read-only.
    新增@property \framework\client\helpers\CdnHelper $cdn The cdn component. This property is read-only.
    新增@property \yii\redis\Connection $redis The redis component. This property is read-only.
    Yii2/web/Application.php
    修改@property \yii\redis\Session $session The session component. This property is read-only.

20151228 修改人 修改要点说明
修改文件列表：
    修改的文件路径1
    修改的文件路径2
修改详细描述：
    按需写简单的修改原因和设计要点。