Update ExceptionHandler.php

Update composer.json

Update README.md

Update Server.php

Merge pull request Hanson#226 from HanSon/analysis-860ZKM

Apply fixes from StyleCI

Merge pull request Hanson#196 from HanSon/dev

修复扩展读取配置

Merge pull request Hanson#193 from HanSon/dev

增加扩展阻拦

Merge pull request Hanson#188 from HanSon/dev

修复扩展状态互相影响

Merge pull request Hanson#183 from HanSon/dev

修复不下载资源时发送消息导致异常

Merge pull request Hanson#169 from HanSon/dev

add setCustomHandler