title: angular-loading-overlay doesn't show anything
body: <p>I have an AngularJS frontent app, where I am using <code>angular-loading-overlay</code> library. The problem is that it doesn't show me my spinner.</p>
  
  <p>I have a template with an assigned controller:</p>
  
  <pre><code>&lt;div ng-controller="FooCtrl" data-ng-init="initFoo()"&gt;
      &lt;div class="bs-loading-container" bs-loading-overlay="FOO" bs-loading-overlay-template-url="/static/spinner.html"&gt;
              ... here some ng-repeat, data for it is loading inside initFoo(); 
      &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>The controller itself:</p>
  
  <pre><code>app.controller("FooCtrl", ['$scope', '$http', 'bsLoadingOverlayService',
      function ($scope, $http, bsLoadingOverlayService) {
          $scope.initFoo = function () {
              bsLoadingOverlayService.start({referenceId: 'FOO'});
              $http.get("/model").then(function (response) {
                      // some long-loading data 
              });
              bsLoadingOverlayService.stop({referenceId: 'FOO'});
          };
  }]);
  </code></pre>
  
  <p>CSS fragment:</p>
  
  <pre><code>.bs-loading-container {
      position: relative; 
  }
  </code></pre>
  
  <p><code>spinner.html</code> itself is some div with text inside (I have simplified it for testing purposes):</p>
  
  <pre><code>&lt;div style="position: absolute; width: 100%; height: 100%; top: 0; left: 0; background-color: rgba(255,255,255,0.7);"&gt;
      &lt;h1&gt;Please, wait...&lt;/h1&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>There is no errors in console. The method <code>initFoo()</code> works fine, it loads a data and the data is drawn in the page after it is loaded fine. But during loading no spinner appears.</p>
  
  <p>Furthermore, if I deliberately change  <code>bs-loading-overlay-template-url</code> to improper path, then I receive errors in console. That means, I guess, that library <code>angular-loading-overlay</code> itself was loaded well.</p>
  
  <p>I know that it is always very specific, but may be any ideas what could I miss and what should I check?</p>