Update DEFT-pubs.json

Author names with initials will need fixing; updated CMUCS, and their paper link re programming with personalized pagerank; link for story-level inference; should fix inconsistent listing of final pair of authors - either include "and" with only one, or with the final two; should fix inconsistent listing of authors - need to decide on first name first or last, and be consistent; added remainder of UT Austin paper title truncated by quote marks; added "n/a" indicator for blank URL fields.