Remove execution right on config files

While merging Claroline/master in my master, which take me several minutes, I found out that this two files has diffrent right than on Claroline/master than on my master.

I found the solution here http://stackoverflow.com/questions/1580596/how-do-i-make-git-ignore-mode-changes-chmod#answer-2083563.

Maybe someone forgot to configure git with `filemode: false`, or I don't know how it can happen.

And yes it takes me several commits to make my master up-to-date, but this is monday morning and the merge is not so easy ;-)