added host-specific queues and now host-wide delay policies can be enforced

[shriphani]

I have added a default-delay-policy (wait 3 seconds before next request). And now, a ready queue is used to look @ the next set of URLs. Increments are done once the handler does what it needs to with the body

[dakrone]

I'm out of the country right now, but I'll take a look when I get back, thanks!