Added description text to index.html demo page.
When a route is added to map, a row in a table is added. This row is removed when the route is removed from the map.
Demo page can now send message to delete route in iframe.
Added comments, removed some calls to "console".
Cleanup
* renamed index.html to demo.html
* jslint compliance changes
Created route-limit-demo
Modified demo for compatibility with Firefox.
Modified demo.js for IE 11 compatibility.
Changed the way HTML data- attributes are accessed for compatibility with older browsers.