Supprt for spiral in application config.
diff --git a/src/folsom.erl b/src/folsom.erl
index 9fbe2e0..250cebd 100644
--- a/src/folsom.erl
+++ b/src/folsom.erl
@@ -42,6 +42,7 @@
        {histogram, new_histogram},
        {history, new_history},
        {meter, new_meter},
+       {spiral, new_spiral},
        {meter_reader, new_meter_reader}]),
     {ok, Pid}.