Ziplib bug

[Josh]

Replace this code:

void ZipFile::Save(ZipArchive::Ptr zipArchive, const std::string& zipPath)
{
  ZipFile::SaveAndClose(zipArchive, zipPath);

  zipArchive = ZipFile::Open(zipPath);
}

With this:

void ZipFile::Save(ZipArchive::Ptr& zipArchive, const std::string& zipPath)
{
  ZipFile::SaveAndClose(zipArchive, zipPath);

  zipArchive = ZipFile::Open(zipPath);
}

The & makes is to the value of the shared pointer passed to the argument gets assigned to the new object.