CrypTen

Add .gitignore file and modify requirements

Del `(object)` from 200 inc deeplearning/aicamera/trainer/utils/metrics.py

Update deprecated PyTorch functions in fbcode/deeplearning (#485)

Replace hasattr with getattr in deeplearning/projects/crypten/test/pytorch_backend/pytorch_tensor.py

Replace hasattr with getattr in deeplearning/projects/crypten/crypten/common/functions/regular.py