Fix Windows line-ending issues

On Windows, any newlines printed to $stdout are automatically converted
to "\r\n", which breaks the protocol buffer format.  Switching $stdout to
binary mode immediately before printing the file prevents this from
happening.

Author: dpwright

bin/protoc-gen-ruby

@@ -26,5 +26,6 @@ rescue => error
   ]
   $stderr.puts response.error
 else
-  print response.to_s
+  $stdout.binmode
+  $stdout.print response.to_s
 end