Fix Forbes source (ad block)

[joshuaeckroth]

An ad is probably blocking Forbes (http://search.forbes.com/search/find?&start=1&tab=searchtabgeneraldark&MT=artificial+intelligence&sort=Date)

Fix that and add it to the sources list (http://www.aaai.org/AITopics/pmwiki/pmwiki.php/AITopics/NewsSources)