BUG: Make mangling path to filename work on Windows
BUG: Make mangling path to filename work on Windows

Thanks to Jon Olav Vik (@jonovik) for the bug report and the patch.

karandesai-96/joblib,aabadie/joblib,tomMoral/joblib,karandesai-96/joblib,lesteve/joblib,tomMoral/joblib,lesteve/joblib,aabadie/joblib,joblib/joblib,joblib/joblib