First stab at adding SQS support
Marshal and Base64 encode objects
Namespace the key
Added aws.yml to gitignore
Moved AWS stuff out of the gem, and turned it into an option
Added size function to queue
Added pop and push
Remove scoperrific from the namespace
Change instance_id to namespace
Changed the criteria for ending the crawl,so that there's no link_queue.num_waiting call
Boosted sleep to 15
Added empty? method to queue
Cleaned up link_queue and page_queue methods
Make SQS queue thread safe