Search Support, Multiple Feeds, Logging, etc

- Set up support for multiple feeds. Now uses a HashMap to keep track of feeds for specific URLs.
- Set up code for search calls
- With multiple feeds, we can now keep track of even search pages
- New loggings
- Callback now shows new articles rather than the total
- Renamed mPages HashMap to pageTracker for easier understanding
- New public method in Article object to return a string without content/description