- All comments of an item can now be seen /comments?item_id=

- Return proper Content-Type header for GET /comments requests
- Got rid of the query processing for index() in REST_Controller()
- Small misc fixes

core/controllers/item.php

@@ -21,9 +21,9 @@ class Item_Controller extends REST_Controller {
   protected $resource_type = "item";
 
   /**
-   *  @see Rest_Controller::_index($query)
+   *  @see Rest_Controller::_index()
    */
-  public function _index($query) {
+  public function _index() {
     throw new Exception("@todo Item_Controller::_index NOT IMPLEMENTED");
   }