saveJSON(file, data)
Encodes an object to a JSON string and saves it to a JSON file. If the given file exists it gets overridden.
Type: function
Parameter(s):
- file {String | File}:The file name or a File instance. 
- data {Object}:The object to encode and save in the file. 
Returns:
- 
    {File}:
 The JSON file the data was written to.