Mixed2

Not news.txt
- fix Conv3d c code versionning that was disabled (Fred
- doc isnan/isinf
- typo
-Add a scan test.

NEWS.txt
- theano-cache cleanup now remove cached module old version of code. (Frederic B.)
-  Fix GPU convolution crash/slowness on Windows 64 bit for the convolution. (Aaron Defazio, Frederic B.)