Add search method to polls

So far the method does not take questions nor answers into account.

This way we'll be able to search polls in the SDG Management section.

lib/tasks/consul.rake

@@ -6,6 +6,7 @@ namespace :consul do
 
   desc "Runs tasks needed to upgrade from 1.2.0 to 1.3.0"
   task "execute_release_1.3.0_tasks": [
-    "db:load_sdg"
+    "db:load_sdg",
+    "db:calculate_tsv"
   ]
 end