$.parseJSON should return any instead of Object

Here is my test:
```js
var i = JSON.parse('1');
var a = JSON.parse('[1]');
var o = JSON.parse('{"foo":"bar"}');
var s = JSON.parse('"string"');
var n = JSON.parse('null');

i instanceof Object; // false
a instanceof Object; // true
o instanceof Object; // true
s instanceof Object; // false
n instanceof Object; // false
```

JSON.parse returns the `any` type so I think this method should do the same.

More of the discussion regarding this pull request can be found on the original commit 8c23d04a5b

https://github.com/borisyankov/DefinitelyTyped/commit/8c23d04a5b4a0505df042a82be90f95adff02d87

jquery/jquery.d.ts

@@ -1214,7 +1214,7 @@ interface JQueryStatic {
      * 
      * @param json The JSON string to parse.
      */
-    parseJSON(json: string): Object;
+    parseJSON(json: string): any;
 
     /**
      * Parses a string into an XML document.