Merge branch 'dev'
adjust wording
update docs
fix _checkSignature bug
Update WeChatClient.zh_CN.php
Merge pull request #1 from dongww/master

Update WeChatClient.zh_CN.php From dongww for [格式调整]
Fix WeChatServer Response media
fix voice mid
json_encode unicode escape fix
Merge pull request #2 from horsley/master

json_encode unicode escape fix
update README
update WeChatServer.php
1.add test
2.adjust folder
Merge branch 'unit-test'
adjust path and comment
backup