Fix race where _ended can flop from true to false
Fix sort order in extract test

Was previously relying on an (outdated) case-insensitive sort.
Bump fstream dep

Now all tests pass
set umask explicitly
add example/doc of using the packer
v0.1.20
fstream@1
v1.0.0
Add test for removing the target on tar extraction

Related to npm/fstream#26
v1.0.1