Merge branch 'mccn_trainer' into 'master'

bob/learn/pytorch/architectures/MCCNNv2.py

bob/learn/pytorch/architectures/__init__.py

bob/learn/pytorch/config/mccnn/wmca_mccnn.py

bob/learn/pytorch/datasets/__init__.py

bob/learn/pytorch/datasets/utils.py

bob/learn/pytorch/extractor/image/MCCNNv2.py

bob/learn/pytorch/extractor/image/__init__.py

bob/learn/pytorch/scripts/train_mccnn.py

bob/learn/pytorch/test/test.py

bob/learn/pytorch/trainers/MCCNNTrainer.py

bob/learn/pytorch/trainers/tflog.py

conda/meta.yaml