Fix admin permissions API endpoint and add test.

I'm not exactly sure what's going on, but this seems like it must have
broken during some gem updates as part of the lua upgrade. The
respond_with output is doing some odd things and the structure of the
data being returned now isn't what's expected.

src/api-umbrella/web-app/app/controllers/api/v1/admin_permissions_controller.rb

@@ -4,7 +4,7 @@ class Api::V1::AdminPermissionsController < Api::V1::BaseController
   skip_after_filter :verify_authorized, :only => [:index]
 
   def index
-    @admin_permissions = AdminPermission.sorted.all
+    @admin_permissions = AdminPermission.sorted.all.to_a
     respond_with(:api_v1, @admin_permissions, :root => "admin_permissions")
   end
 end

src/api-umbrella/web-app/spec/controllers/api/v1/admin_permissions_spec.rb

@@ -0,0 +1,29 @@
+require "spec_helper"
+
+describe Api::V1::AdminPermissionsController do
+  before(:all) do
+    @admin = FactoryGirl.create(:admin)
+  end
+
+  describe "GET index" do
+    it "returns the expected permissions in the display order" do
+      admin_token_auth(@admin)
+      get :index, :format => "json"
+
+      data = MultiJson.load(response.body)
+      permission_names = data["admin_permissions"].map { |permission| permission["name"] }
+      permission_names.should eql([
+        "Analytics",
+        "API Users - View",
+        "API Users - Manage",
+        "Admin Accounts - View & Manage",
+        "API Backend Configuration - View & Manage",
+        "API Backend Configuration - Publish",
+      ])
+
+      data["admin_permissions"].first["id"].should eql("analytics")
+      data["admin_permissions"].first["name"].should eql("Analytics")
+      data["admin_permissions"].first["display_order"].should eql(1)
+    end
+  end
+end