Proto commits in swigger/wechat-ocr

These 5 commits are when the Protocol Buffers files have changed:

Commit:6c5a990
Author:lixungeng

Add weixin 4.0 OCR support

The documentation is generated from this commit.

Commit:1c95f5d
Author:lixungeng

add C# demo and encoding check.

Commit:c8ff85d
Author:lixungeng

checked range of task_id

Commit:9e94025
Author:lixungeng

update proto

Commit:8d31ca4
Author:lixungeng

init version of wechatocr caller