JSON Utility - Release Notes

2.5.0
    * Restructured for customization and readability
    * Extracted isValid method to test a JSON string
    * Extracted dateToString method to allow overriding with custom serialization format
    * Added stringToDate method to reconstitute Date instances from default JSON UTC date strings.  Use this in a filter method passed to lang.JSON.parse
    * fixed walk method so filters are properly applied

2.4.0
    * Initial release
