cash-global doesn't work in non-English operating systems

Installing cash-global won't work properly in any OS whose language isn't English. That seems to be because of the test for the "Could not find" output of the where command in the bin/preinstall.js returning false positives in other languages. I couldn't find it in the original source code though but I certainly don't actually have a grasp of the projects bigger structure.

For example the failing output of where in my German Windows looks like this

INFORMATION: Es konnten keine Dateien mit dem angegebenen Muster gefunden werden.

I'd suggest using the npm which package instead since it's going to be included in the application anyways according to #71.