Added vldb publication
Added vldb publication

Summary: Added new vldb paper in literature.xml.

Test Plan: n/a

Reviewers: avery.ching, sergey.edunov, maja.kabiljo, ikabiljo

Reviewed By: ikabiljo

Differential Revision: https://reviews.facebook.net/D45399

KidEinstein/giraph,apache/giraph,KidEinstein/giraph,KidEinstein/giraph,apache/giraph,apache/giraph,apache/giraph,dukechain/giraph-1.2,dukechain/giraph-1.2,KidEinstein/giraph,dukechain/giraph-1.2,dukechain/giraph-1.2,apache/giraph,KidEinstein/giraph,KidEinstein/giraph,dukechain/giraph-1.2,dukechain/giraph-1.2,apache/giraph