Make AjaxRequest public to enable _YourType_Loader creation

Good day everyone! I working on extension of ```AssetLoader``` that provides possibility to load bare Json, so I needed somekind of ```JsonLoader``` (like ```SpriteSheetLoader```), but it uses ```AjaxRequest``` which is private (due ```into.js``` and ```outro.js```). Can it be public?

P.s. I know, that, maybe, it easier to write my own, but it's already there.