#4 Allow for items to be deduplicated under a different name.

This will allow us to put context information in the item name, while not including the context information in the deduplication process. Using this, we can get rid of most of urls:filters, since those are mostly in place to prevent loops on bad on bad page requisites. The context would hold the crawling depth, and we would not queue a new URL if depth is over a certain threshold. Example: `url=URL&context=CONTEXT` would be deduplicated under for example `URL`