Add support for changing settings

I added this to the set method in the loop in order to change settings like format and labels. As "clear" is also defined you have to add "settings." to the item, so set('settings.format','yyyy/mm/dd') for example:

if (thingItem.indexOf ('settings.') != -1)
SETTINGS[thingItem.substring ('settings.'.length)] = thingValue;

Adding this at the end of the get method enables you to read settings to (like get('format')):

return SETTINGS[thing];

That's quick and dirty so please do your own implementation.