Update jquery.d.ts

parseJSON should return any. If it returns Object the properties cannot be accessed without typecasting.
Added placeholder to SortableUIParams
Signature fix
Merge pull request #557 from elsassph/master

A little signature fix for PreloadJS
Merge pull request #554 from basarat/patch-2

Update jquery.d.ts
Merge pull request #555 from thomasandersen/jqueryui-sortable

Added placeholder to SortableUIParams