Update to Python 3 and other nice things#8

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varunagrawal wants to merge 7 commits intoGT-Vision-Lab:masterfrom varunagrawal:master

Commits on May 29, 2018

Commits on Jul 26, 2018

generic path for root_dir and update for v2
varunagrawal
committed

Commits on Jan 9, 2019

download scripts for Questions, Annotations and Images
varunagrawal
committed
restructured the vqa evaluation tools so it resembles a python package
varunagrawal
committed

Commits on Jan 18, 2019