Better log rotation for Passenger

Touch the tmp/restart.txt file, when
rotatingthe log files. Otherwise, multiple
workers may try to rotate the log files
at the same time, with sub-optimal results.

Also, an aesthetic tweak to the url_generator.

lib/logging_stuff.rb

@@ -0,0 +1,20 @@
+class Logger
+  class LogDevice
+
+  private
+    def shift_log_age
+      #For Passenger, restart the server when rotating log files.
+      FileUtils.touch Rails.root.join("tmp", "restart.txt") if defined?(PhusionPassenger)
+      (@shift_age-3).downto(0) do |i|
+        if FileTest.exist?("#{@filename}.#{i}")
+          File.rename("#{@filename}.#{i}", "#{@filename}.#{i+1}")
+        end
+      end
+      @dev.close
+      File.rename("#{@filename}", "#{@filename}.0")
+      @dev = create_logfile(@filename)
+      return true
+    end
+
+  end
+end