Created process to deal with Internet connections.
Final iteration:
web_lib is now a single process.
All internet connections are serialized through the web_lib process.
Image download has the top priority, only if there are no remaining images to download, the crawling will continue.
Consumes WAY less memory, it checks for duplicates in all slave queues.
Merge pull request #50 from stbnps/master

Harder better faster stronger.