Add websocket example

[ghost]

A websocket example that takes data from a redis queue and sends it to the browser.

[coveralls]

Coverage remained the same at 93.83% when pulling b797191 on websocket into 1089c6c on master.

[landscape-bot]

Repository health increased by 2% when pulling b797191 on websocket into 1089c6c on master.

• 3 new problems were found (including 0 errors and 3 code smells).
• 9 problems were fixed (including 0 errors and 9 code smells).