RepositoryQuery: Add method __toString()

library/Icinga/Repository/RepositoryQuery.php

@@ -73,6 +73,16 @@ class RepositoryQuery implements QueryInterface, SortRules, FilterColumns, Itera
         $this->iterator = clone $this->iterator;
     }
 
+    /**
+     * Return a string representation of this query
+     *
+     * @return  string
+     */
+    public function __toString()
+    {
+        return (string) $this->query;
+    }
+
     /**
      * Return the real query being used
      *