Add support for ngRoute

Check whether ui-router is loaded with something like the following and then act accordingly.

``` javascript
function uiRouterLoaded () {
try {
angular.module('ui.router'); // blows up if not defined
return true;
catch (err) {
return false;
}
}
```

Start by locating the existing ui-router integration and AngularJS module setup; the issue provides no file or test names. Confirm the expected behavior for ngRoute, implement equivalent support, and verify flash messages work when ui-router is absent and ngRoute is used.

Written by the indexing model from the issue text.