Merge pull request #239 from goodfeli/to_rebase

rebased Razvan's Rop/Lop pull request It was checked by me and Ian.

Merge pull request #239 from goodfeli/to_rebase
d8c5ab33 · Razvan Pascanu · 2cdfc327 · 8e0301c5 · d8c5ab33
--- a/theano/tensor/tensor_grad.py
+++ b/theano/tensor/tensor_grad.py