Removing FindCerf.cmake from Steca

Resolves #100 (closed) I took a look at your Issue 100. This compiles and works. However I was unsure whether you really wanted to have changed the name from CERF to cerf in the variables, so I stayed with this intermediatere solution for the suggestion.

I also read Issue 101. I think this is rather straight forward with this now. If you want me to tackle this issue as well, I would kindly ask for corresponding access permissions to these repositories