staging module can create 0 length files

[vchepkov]

Commands like wget can fail to download a file and create a file with 0 length instead
The next time agent runs it will see the file and won't retry to download it again.
I made an attempt to create a workaround in #42 , but it's not compatible with Windows

[ekohl]

This module is deprecated in favor of puppet-archive and as such won't receive any more updates.