Sigmoid

We were not returning () when the scalar op don't have a version.

it was triing the Image2Neibs.perform method for GpuImage2Neibs.

Do this for amdlibm.

There is code for sigmoid, but it is disabled as it is slower.

this add extra useless code.

Fix-crash in scan grad when compute_test_value=raise

Add test

fix gh-1385

Fix scan gpu loop

[FIX] Py24

update the release instruction to tell to update this page.

Detect if the inner replacement would have a different type,
so that a new gpu_from_host is not inserted in the inner graph
in replacement of the one that was just pushed out.

MAINT: Remove unnecessary check from before swapaxes (API change)

Make GPU Ops accept TensorType output gradients (transfer them to GPU)

Fix opt error when trying to access a python list with a Type object.

Make test more resistent to different seed value.

Image2Neibs.perform

correctly fix the test with numpy 1.7.1

Tell witch version of NumPy have this bug.

Add MakeVector.c_code

In NumPy, I have a PR that make it use array_priority for comparison. The new test assert that it don't work, or work correctly.