Feature suggestion: API endpoint for printing status

[ururk]

I looked over https://github.com/Printrbot/Printrhub/blob/master/esp/src/web_server.cpp, it would be great if you could add an endpoint to display printing status. Specifically, print time, % complete, etc...

I wanted to add a use case, as it would be a useful addition, and not just a cool feature: We make parts for use in our classrooms, and we are used to printing large batches of parts overnight with a Metal Plus. My hope with the simple is that we could have students in our shop print parts as needed, or perhaps if I need something small I could use it instead of the plus. However, I'm not always able to view a webcam, and would like to get notifications when a job is complete - or be able to check on status without viewing a video feed.