Second part of admin-namespace-reorder. Also renamed OrderGroup into Ordergroup. More view-sharing between groups is neccessary.

test/functional/admin/ordergroups_controller_test.rb

@@ -0,0 +1,8 @@
+require 'test_helper'
+
+class Admin::OrdergroupsControllerTest < ActionController::TestCase
+  # Replace this with your real tests.
+  test "the truth" do
+    assert true
+  end
+end