Merge branch 'new-features' into 'master'

bob/learn/tensorflow/dataset/__init__.py

bob/learn/tensorflow/dataset/generator.py

bob/learn/tensorflow/dataset/tfrecords.py

bob/learn/tensorflow/extractors/Base.py

bob/learn/tensorflow/extractors/Estimator.py

bob/learn/tensorflow/extractors/Generic.py

bob/learn/tensorflow/extractors/__init__.py

bob/learn/tensorflow/layers/Maxout.py

bob/learn/tensorflow/layers/__init__.py

bob/learn/tensorflow/loss/ContrastiveLoss.py

bob/learn/tensorflow/loss/__init__.py

bob/learn/tensorflow/loss/utils.py

bob/learn/tensorflow/loss/vat.py

bob/learn/tensorflow/network/InceptionResnetV1.py

bob/learn/tensorflow/network/InceptionResnetV2.py

bob/learn/tensorflow/network/MLP.py

bob/learn/tensorflow/network/__init__.py

bob/learn/tensorflow/network/utils.py

bob/learn/tensorflow/script/cache_dataset.py

bob/learn/tensorflow/script/compute_statistics.py