Explicitly convert the buffer array to a string before writing to hea…

…d off compatibility issues with outputs that don't fully quack like an IO.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7734 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/lib/active_support/buffered_logger.rb

@@ -91,7 +91,7 @@ def auto_flushing=(period)
     end
 
     def flush
-      @log.write(@buffer.slice!(0..-1)) unless @buffer.empty?
+      @log.write(@buffer.slice!(0..-1).to_s) unless @buffer.empty?
     end
 
     def close