fix queueing problems
fix queueing problems

* increase polling timeout because it gets tripped when there are a few
topics running at once
* change fetch_link queueing system to die() if the polling timeout is
hit and there are more than a few urls in the queue
* fix bug in add_new_links chunking

berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud