Added for models from Oxford

Added four resnet based models from:

http://www.robots.ox.ac.uk/~albanie/models/pytorch-mcn/resnet50_scratch_dag.py
http://www.robots.ox.ac.uk/~albanie/models/pytorch-mcn/resnet50_scratch_dag.pth



http://www.robots.ox.ac.uk/~albanie/models/pytorch-mcn/resnet50_ft_dag.py
http://www.robots.ox.ac.uk/~albanie/models/pytorch-mcn/resnet50_ft_dag.pth
http://www.robots.ox.ac.uk/~albanie/models/pytorch-mcn/senet50_scratch_dag.py
http://www.robots.ox.ac.uk/~albanie/models/pytorch-mcn/senet50_scratch_dag.pth

http://www.robots.ox.ac.uk/~albanie/models/pytorch-mcn/senet50_ft_dag.py
http://www.robots.ox.ac.uk/~albanie/models/pytorch-mcn/senet50_ft_dag.pth

All of them were trained with the VGG2 dataset