Merged Personal Kytten fork with latest ramovsky/Kytten version 3711e49df0
Added Support for TextureAtlases in the kytten classes Image, GuiElement (and GuiFrame). Documented some functions. Corrected bug on unicode convertion error in Checkbox and KyttenLabel. Refactored a little the GuiManager.
Refactoring kytten.Label to avoid recreating KyttenLabel on each modification.
Added full text postionning support for ImageButton and subclasses. Various bug fixes and code refactoring.
Added _force_refresh callback and refactored kytten widgets to use it.
Fixed bug in Document widget. Error when inserting text when document was not visible.