登録
/walter register [token from slack profile page]
tokenの発行url
https://app.wercker.com/profile/tokens
subscribe
/walter subscribe to [owner/app name] by [me, wercker username or any] on [fail, pass or all]
/walter register [token from slack profile page]
tokenの発行url
https://app.wercker.com/profile/tokens
/walter subscribe to [owner/app name] by [me, wercker username or any] on [fail, pass or all]