add polynomial kernel and test + created layer nystrom and fastfood + update utils

skluc/main/tensorflow_/kernel.py

...c/main/tensorflow_/kernel_approximation/fastfood_layer.py

skluc/main/tensorflow_/kernel_approximation/nystrom_layer.py

skluc/main/tensorflow_/utils.py

skluc/main/tools/experiences/cluger.py

skluc/main/tools/experiences/gather_results.py

skluc/test/test_kernel.py