open file in binary mode to solve corrupted files on Windows. Closes #13
open file in binary mode to solve corrupted files on Windows. Closes #13

As outlined here https://github.com/rubyzip/rubyzip/issues/175 files
should be opened in binary mode:

```
"b"  Binary file mode
     Suppresses EOL <-> CRLF conversion on Windows. And
     sets external encoding to ASCII-8BIT unless explicitly
     specified.
```

alepore/sablon,Wevorce/sablon,senny/sablon,invoscape-team014/sablon-updated,fullfabric/sablon