split run method to init_as_task and run

[firemark]

No description provided.

[pfalcon]

Thanks, but it's unclear why this refactor would be needed. And there's an example how to run a concurrent task together with picoweb's main task already: https://github.com/pfalcon/picoweb/blob/master/examples/example_eventsource_push.py

[pfalcon]

As commented, such a method isn't really needed. So, closing, feel free to reopen if you have good arguments to continue the discussion (but mind e.g. #20).