add code to cache resnet features

answer_classifier/eval.py

answer_classifier/fine_tune.py

answer_classifier/inference.py

answer_classifier/train.py

cache_resnet_features_vgenome.py

cache_resnet_features_vqa.py

constants.py

data/vqa.py

losses.py

object_attribute_classifier/inference.py

object_attribute_classifier/train.py

test_resnet_inference.py

tftools/data.py

vqa_parser.py

word2vec/word_vector_management.py