composer require "dektrium/yii2-user:0.9.*@dev" 一直安装失败，提示：Your requirements could not be resolved to an installable set of package.
Problem 1
- yiisoft/yii2 2.0.2 requires bower-asset/jquery 2.1.*@stable -> no matching package found.
建议大家遇到问题，还是到 yiiframework.com 去找答案，看下面的两张截图就知道。
参考博文链接：http://www.neatstudio.com/show-2616-1.shtml
解决办法：(安装composer的插件)
composer global require "fxp/composer-asset-plugin:1.0.0"
yiichina.com 的安装说明：
yiiframework.com 安装说明：