Merge pull request #14 from tylerholien/master

Fixed one more source of Encoding::UndefinedConversionError errors.

lib/log4r/outputter/datefileoutputter.rb

@@ -107,7 +107,7 @@ def change
         }
       end
       makeNewFilename
-      @out = File.new(@filename, (@trunc ? "w" : "a"))
+      @out = File.new(@filename, (@trunc ? "wb" : "ab"))
       Logger.log_internal {
         "DateFileOutputter '#{@name}' now writing to #{@filename}"
       }