just to point into T.grad

Stop relying on undocumented behaviour of numpy.nditer.

fix bad test

add some type checking

Use the documented way that numpy.nditer work. numpy 1.7.0b2 raise a ValueError with the not documented behavior.

Gpu reduce small change.

I kept the check elsewhere to allow finding where this could cause
problem more easily.

Gpu reduce shape0

Gpu max

This fix a new test for a new feature.

If travis would have run the tests, it would have detected it, but it didn't ran...

This fix a crash recently added in 5178e4

added eval method and tests

Gpu alloc2

We need to update the second var before we use it!

This is a significant speed up with the gc as most of the time, we
don't need it and allocating on the GPU is slow.