Make sure path names inserted into ZIP files are normalized to use "/" as the directory separator, as required by the format specification.
Make sure path names inserted into ZIP files are normalized to use "/" as
the directory separator, as required by the format specification.

This closes SF bug #440693.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator