Adding binmode => ':raw' to the file opening

Necessary because we run under PERL_UNICODE=SAD, which changes the default layer
for any filehandles, even those opened by third-party libraries.
http://www.dagolden.com/index.php/1771/why-perl_unicode-makes-me-sad/
Merge pull request #2 from kgoess/raw-open

Adding binmode => ':raw' to the file opening