pull moderator into own column, rename trust levels

db/migrate/20130320024345_add_moderator_to_user.rb

@@ -0,0 +1,10 @@
+class AddModeratorToUser < ActiveRecord::Migration
+  def up
+    add_column :users, :moderator, :boolean, default: false
+    execute "UPDATE users SET trust_level = 1, moderator = 't' where trust_level = 5"
+  end
+
+  def down
+    remove_column :users, :moderator
+  end
+end