Tests with dropout

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/layers/Dropout.py

bob/learn/tensorflow/layers/MaxPooling.py

bob/learn/tensorflow/layers/__init__.py

bob/learn/tensorflow/network/Lenet.py

bob/learn/tensorflow/network/LenetDropout.py

bob/learn/tensorflow/network/MLP.py

bob/learn/tensorflow/network/SequenceNetwork.py

bob/learn/tensorflow/network/__init__.py

bob/learn/tensorflow/script/train_mnist.py

bob/learn/tensorflow/script/train_mnist_siamese.py

bob/learn/tensorflow/trainers/SiameseTrainer.py