Webssh

Add
* Support docker.

Fix
* Websocket error when index url contains a query string.

Update
* Support tornado 6.0.x

Update

* Use `ThreadPoolExecutor` to limit concurrent connections.
* Support tornado 6.0.0.

Add

* Support CORS

Update
* Update xterm.js to the latest version 3.11.0
* Update bootstrap to the latest version 4.3.0

Version
* jquery.min.js 3.3.1
* popper.js 1.14.7
* bootstrap.min.js 4.3.0
* xterm.min.js 3.11.0
* fullscreen.min.js 3.11.0

Add

* Support cross origin iframe connection.

Add
* Added an option `maxconn` for limiting connections for every single client determined by the ip address.