Padding

[PrimozGodec]

Thank you for a great framework. In the current implementation, I do not find an option to set padding setting for a convolutional layer (options would be 'valid', 'same', ...). Am I right that there is no an option to set it? If not I am very interested in having it. So I would implement it if you are interested in this option. Just let me know if you are interested and I will prepare a pull request.