Model files shouldn't be distributed in the repository

[dmcc]

Instead, the Makefile should download them from a website. It should run a script which would give you options for downloading the WSJ English model, the self-trained newswire model, the self-trained biomedical model, and possibly the best AnyDomain parsing models. It should handle reranker models as well.

[dmcc]

Also, we should stop distributing models that use the AUX tag.