Added more options to the `watership-consume` script

```
Usage: watership-consume [options]
    -r, --run class                  Camelcased name of the consumer class to run/use
    -b, --bind binding               Bind to a queue (with routing key after /)
    -c, --concurrency concurrency    Amount of concurrent consumers/threads
    -u, --amqp-uri uri               URI string of the AMQP server to consume from
    -p, --db-pool dbpool             Amount of open database connections
```