Multi-threaded RSS Feed News Aggregator
 RSS news feeds are XML documents with information about online news
 articles.
If we can get the feeds, we can get the articles, and if we can get the
 articles, we can build an index of information similar to that held by news.google.com.
Sample Usage:./news-aggregator large-feed.xml

Enter a search term [or just hit <enter> to quit]: economy
That term appears in 35 articles. Here are the top 15 of them:
1.) "Job market resilience eases growth concerns" [appears 17
times]. "http://feeds.chicagotribune.com/~r/chicagotribune/news/nationworl.....1.htm"
2.) "U.S. economy adds 165,000 jobs in April" [appears 8
times]. "http://feeds.latimes.com/~r/latimes/news/~3/2RZf_632I-M/story01.htm"
3.) "Cash still king in China, largest bill is worth $16" [appears 4
times]. "http://seattletimes.nwsource.com/html/nationworld/2020918120_chin.....n=rss"
4.) "Buffett says people will call Berkshire when he's gone" [appears 3
times]. "http://feeds.chicagotribune.com/~r/chicagotribune/news/nationworl.....1.htm"
5.) "California may go forward without a financial reserve" [appears 3
times]. "http://feeds.latimes.com/~r/latimes/news/~3/m8RSqmKTa8M/story01.htm"
6.) "Obama wraps up Latin trip with an eye back home" [appears 3
times]. "http://seattletimes.nwsource.com/html/nationworld/2020914348_aplt.....n=rss"
7.) "California tax revenue yields multibillion-dollar surplus" [appears 2
times]. "http://feeds.latimes.com/~r/latimes/news/~3/bFC8FynAuM4/story01.htm"
8.) "s trip to Mexico hints at new balance of power" [appears 2
times]. "http://feeds.washingtonpost.com/c/34656/f/636708/s/2b7ace83/l/0L0.....1.htm"
9.) "Warren Buffett leads annual meeting like no other" [appears 2
times]. "http://seattletimes.nwsource.com/html/businesstechnology/20209213.....n=rss"
10.) "Harvard professor apologizes for remarks about Keynes" [appears 2
times]. "http://seattletimes.nwsource.com/html/nationworld/2020924281_sorr.....n=rss"
11.) "Florida Legislature concludes in a burst of bipartisanship" [appears
2
times]. "http://www.miamiherald.com/2013/05/03/3379285/upbeat-lawmakers-ce......html"
12.) "If named transportation secretary, Foxx oversees regulator" [appears
2 times].
2
"http://www.newsobserver.com/2013/05/04/2871195/if-named-transport.....k=rss"
13.) "s cap & groan time" [appears 2 times].
"http://www.nypost.com/p/news/business/it_cap_groan_time_nO6yKVt81.....iness"
14.) "Marathon bombing suspect Tamerlan Tsarnaev died.....icate" [appears
1
time]. "http://feeds.boston.com/c/35022/f/646891/s/2b81283d/l/0L0Sboston0.....1.htm"
15.) "Beverly's own American idol comes home" [appears 1 time]. "http://feeds.boston.com/c/35022/f/646891/s/2b84a294/l/0Lboston0N0.....1.htm"ItObama