Fixed issue with new years period not showing next years Jams.
Also now auto loads json file based on current year.
Caveat: json files for next year must exist in period leading up to new year, or JS script will fail
Won't make much of a difference for the few days remaining in this year, but should be improvement for next year.
Better error handling if xxxx.JSON file missing, just carries on now.
Cleaned up the comments.
removed the map file.
Merge pull request #96 from madmarcel/master

Fixed issue with new years period not showing next years Jams.