inital attempt at contours

pg/sql/0.0.1/07_contours.sql

@@ -0,0 +1,12 @@
+
+
+CREATE OR REPLACE FUNCTION
+  cdb_contours_count (
+      query TEXT,
+      levels NUMERIC[]
+  )
+RETURNS TABLE (the_geom geometry , level Numeric)
+AS $$
+  from crankshaft.contours import create_countours_count
+  return create_countours_count(query,levels)
+$$ LANGUAGE plpythonu;