Live submission feed (uWSGI)

Now using [WebSockets in uWSGI](http://uwsgi-docs.readthedocs.org/en/latest/WebSockets.html). See https://github.com/zeekay/flask-uwsgi-websocket.
I encountered a problem with a number of spawned async cores. It's set to 100 there, so when 100 clients connect simultaneously (open homepage) the rest will have to wait.