added scipy.stats.chi2.sf op
made chi2sf binary, fixed reviewer comments
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.
Merge pull request #1410 from ebuchman/chi2sf/master

added scipy.stats.chi2.sf op