PerfWrapper does not handle spaces in paths

[RobbeDGreef]

If you have a path that contains a space, the perf wrapper will throw an error and fail because it performs commands using the shell_out function and passes this function a string where it simply concatinates all the arguments.
The shell_out function will then split the string into arguments, but in doing so, split a path that contains a space into two separate arguments instead of one path as an argument.

This will then fail in the various command line tools that it calls.

This also means that you will get errors if you put a space in your CampaignCartesianProduct benchmark name because it uses this name to generate a folder for the output.
If you get this error because you have a space in the path leading to your campaign due to a folder with a space in it then you brought this on yourself because who does such a thing :P

[apaolillo]

Aaah these spaces in paths.. ruining everything :D
With @aaronbog we are working on a revamp of the "shelling out" low-level implementation. These issues should disappear in the new version.