新手在执照yii教程来的时候，config/main.php文件是全新写的，post提交的时候，会出错
include(LoginForm.php) [<a href='function.include'>function.include</a>]: failed to open stream: No such file or directory
需要在config/main.php文件里设置，增加：
'import'=>array(
'application.models.*',
'application.components.*',
),