FIX: correct old username index

(in some cases search was not finding accounts)

db/migrate/20141118011735_correct_username_search.rb

@@ -0,0 +1,11 @@
+class CorrectUsernameSearch < ActiveRecord::Migration
+  def up
+    execute "update user_search_data
+              set search_data = TO_TSVECTOR('simple', username_lower || ' ' || lower(name))
+            from users
+            where users.id = user_search_data.user_id"
+  end
+
+  def down
+  end
+end