unit test just to make sure. Also changed dimensions of matrix in unit test not
to be square.

moved Tensor -> NDArrayType, TensorResult -> NDArrayResult, as_tensor -> as_tensor_result, Sparse -> SparseType, as_sparse -> as_sparse_result, closes #243

* Added test case to test this scenario

* Cleaned up code and made make_mi (now make_module_instance) method a lot more
generic. It will now find and "make" (i.e transfer from local_attr dictionary to
properly wrapped module members) any submodule, whether its in a list, list of
lists, dictionary, etc