returns an array of strings that contains all the keys of the object in the form ['key1', 'obj.key11'].
Usage
var obj = "name": "Jessie J" "rating": 69 "image_path": "/test.jpg" "alternative_name": null "alternative_name2": undefined "obj": "23": "yo": "lol" "objectID": "551491260" console;/*[ 'name', 'rating', 'image_path', 'alternative_name', 'alternative_name2', 'obj.23.yo', 'objectID']*/