Facade connected to Feed, Flows added to Feed

Client on UI sends request to Facade through WebSocket; Facade publishes
FEED_REQ JSON message to Facade Topic; Feed Service receives the message
and starts Feed generator; Feed generator posts REED_RSP messages to
Facade Topic for every quote; Facade Service receives FEED_RSP messages
and sende them back to correspondent WebSocket client.

TODO: Make Generator service a singleton and run independently from
Facade requests.