text: define(['backbone'], function (Backbone) {
      return Backbone.Model.extend({
          url: window.location.rootpath + 'session',
  
          testCredentials: function(email, password) {
              return $.ajax({
                  url: this.url,
                  type: "POST",
                  data: {
                      email: email,
                      password: password
                  }
              });
          }
      });
  });