title: angular .then() is not recognized
body: <p>I  try to use .then() in my angular controller</p>
  
  <pre><code> angular.module('n2goApp')
          .controller('MainCtrl', function($scope, Products) {        
                  Products.get(). then( function ( response ) {
                      $scope.data = response;
                      console.log(response);
                      $scope.totalPages = response.TotalPages;
                      $scope.totalItems = response.total;
                      $scope.products = response.data;
                      $scope.currentPage = response.current_page;
                      $scope.maxSize = 5;
                      $scope.setPage = function(pageNo) {
                          $scope.currentPage = pageNo;
                      };
                  });
  });
  </code></pre>
  
  <p>but drops me an error </p>
  
  <pre><code>Error: Products.get(...).then is not a function
  </code></pre>
  
  <p>Service</p>
  
  <pre><code>angular.module('n2goApp')
    .service('N2goservice', function N2goservice() {
      // AngularJS will instantiate a singleton by calling "new" on this function
    }).factory('Products', ['$resource', function($resource) {
  
          var url = 'http://domain.com/api/products';
      return $resource( url + '/:prodID', 
          { bookId: '@prodID' }, { 
              loan: { 
                  method: 'PUT', 
                  params: { prodId: '@prodID' }, 
                  isArray: false 
              },
                          get:{
                               method: 'GET', 
                   params: { 
                                   prodId: '@prodID',
                                   page:'@page'
                                  }, 
                  isArray: false
                          }
              /* , method3: { ... } */
          } );
  
  }]);
  </code></pre>
  
  <p>What I'm doing wrong?</p>