Weka's module: package "FeedReader" second quick revision:

- change content to description (due to unification between "El Mundo" and "El País")
- Change the way to determine the feedUrl when using the FeedParser, now it's an argument to the readFeed method (instead to the constructor)
- Updated the example
Removed the references to "as.com" from the rss config file: The response from as.com were needed to be parsed specially. No time to do this.
minnor refactoring in FileWriter and TextClassifierExample
FeedReader class which:

1.  Reads a configuration file with a list of rss links classified by category
2.  For each rss link, parse the feed
3.  Creates a output arff file using ArffWritter class

and the output arff file for 28/04/2014