add support for hidden api keys, used in hosting scenarios

db/migrate/20141120043401_add_hidden_to_api_keys.rb

@@ -0,0 +1,7 @@
+class AddHiddenToApiKeys < ActiveRecord::Migration
+  def change
+    change_table :api_keys do |t|
+      t.boolean :hidden, null: false, default: false
+    end
+  end
+end