v0.4.3

0.4.3 NN - Autograd - Random - Plot - Faster iteration (#42)

* testing yielding over iterators

* tri iterator

* iter complete

* sorting for tensors

* matrix exponential using pade

* neural network basics

* remove req

* move images

* full implementation of autograd and better networks

* Added plplot bindings

* merge PRs

* docs

* remove dataframes

* more activation

* default bias

* random creation methods using alea