Adds bin/flapjack-feed-events, which feeds once-off and streams of JSON-encoded events into the events queue for Flapjack to process.

Options
 -c, --config [PATH]  PATH to the config file to use.
 -f, --from [FILE]    path to the FILE to process; if not provided,
                      defaults to STDIN.

(Note: to avoid accidents where the script would look like it's hanging
 or processing forever, flapjack-feed-events will print a warning and
 bail if neither a pipe nor file is provided.)