* update module to check weights on load, also fix docs and reorganize tests
* nits + rebase
* a few more docs updates for Module
* use manual module file
* comment
* added mse_loss, nll_loss and kl_div_loss
* fixed axis not defined error in nll_loss
* fixed axis not defined in kl_div_loss
* added tests for mse, nll and kl_div
* modified docstrings and added reduce helper func
* updated docstring in kl_div_loss and moved helper func
* added new kl divergence implementation
* added reduction to test
* updated docstring of kl_div_loss with correct spelling
* added losses to nn.rst in docs