Socketio integration and configurable path prefix via REFORIS_PREFIX env var

reforis integrates WS server - through socketio

Url path can be configurable. This has to be set in two places:
* setting env var REFORIS_PREFIX='/my-path' while running pip install
* running reforis binary with --prefix `/my-path`

Other stuff
* add --debug option to reforis bin
* eventlet integration with reforis