Merge Ionization into Dev to see changes

The code is compiling but once I try to run it, I am receiving a SegFault without much other comment. 
That happens when I use CUDA 5.5 or 6.0. If I use 6.5 it tells me that it cannot find a CUDA capable device.
BTW ... that solved all my problems 
I could have spared myself much trouble if I had seen that earlier ...
Thanks @psychocoderHPC !!