Change Link Classifier to classify KBPQueryLink objects

... instead of the linker's own EntityLink objects. This gives us explicit control over what information the classifier has access to. I'm in the process of playing around with new features, but haven't settled on any yet, so it's still the same feature set. Feel free to add any new features you can find that help, too. 

I also created separate training from both 2012 and 2011.