introduced url > number mapper.
introduced riak tools.
renamed feeder to queue.
node v0.10.0 is out.
responsible for 1 block. (config.block)
get initial urls from store.
better modulo calculation, hash whole url.
refactoring initialization of components (queue, fetcher, store,
extractor)
refactoring.
introduced dispatcher (of urls).
due to previous refactoring.
dont fetch the same page twice in one `crawl`