New functions, default model settings and string prototype method

* Expand and expose the 'getRenderObject' function, which was
  originally used inside components but abandoned for performance
  reasons. It however is still useful for getting the render
  object from uncaught errors.

* Added 'sort' option to the DbQuery code.
  The default value for models is sorting by creation date.

* Added a 'multiply' method to the string prototype,
  which does just what it says.