Add websocket keepalive to cowboy
Add deep_params and deep_query params.

Upsame sample handler to give us an error message and not let the server
swallow the error messages.
Refactor cowboy keepalive. Build native keepalive.
Use 1006 close on websocket timeout
Fix cowboy timeout call
Ensure log dir exists for inets so it doesn't crash
Add yaws keepalive stuff