pep8
fix crash.
fix compilation on the CPU.
Fix compilation on the GPU.
Add name to Theano fct in tests.
Fix and enable Chi2SF[Inplace]Tester tests.

they work on the GPU.
make empty list of floatX dtype.
Merge pull request #1 from nouiz/ebuchman-chi2sf/master

Finish chi2 tests and GPU code.