add VQA data manager and work on answer graph creation

answer_classifier/__init__.py

answer_classifier/inference.py

answer_classifier/train.py

constants.py

data/#vqa.py#

data/.#vqa.py

data/vqa.py

object_attribute_classifier/compute_AP.py

object_attribute_classifier/eval.py

object_attribute_classifier/inference.py

object_attribute_classifier/train.py

question_parser/simple_parser.py

region_relevance_network/__init__.py

region_relevance_network/inference.py