Add extra debug info in verify_grad.
Fix error on the GPU for ExtractDiag.

When the output was of size 0, we where returning a numpy ndarray
instead of a CudaNdarray.

No news, as this is a fix to something new since the last release.
Make ArcsinTester pass in float32.

The old range was causing nan in float32.
pep8
Added print information when we run theano tests in batch.

This print the time used for each batch.