Unit tests

bob/learn/tensorflow/analyzers/ExperimentAnalizer.py

bob/learn/tensorflow/datashuffler/Disk.py

bob/learn/tensorflow/datashuffler/SiameseDisk.py

bob/learn/tensorflow/datashuffler/TripletDisk.py

bob/learn/tensorflow/initialization/Constant.py

bob/learn/tensorflow/initialization/Gaussian.py

bob/learn/tensorflow/initialization/SimplerXavier.py

bob/learn/tensorflow/initialization/Xavier.py

bob/learn/tensorflow/network/MLP.py

bob/learn/tensorflow/network/SequenceNetwork.py

bob/learn/tensorflow/script/train_mnist_siamese.py

bob/learn/tensorflow/test/test_cnn.py

bob/learn/tensorflow/test/test_dnn.py

bob/learn/tensorflow/trainers/SiameseTrainer.py

bob/learn/tensorflow/trainers/Trainer.py

bob/learn/tensorflow/trainers/TripletTrainer.py