Fix to pick up events with .com URLs in JSON

Eventbrite maps .co.uk URLs to .com ones in their API, and this is
reflected in the generated JSON, so the Javascript here tries the .com
URL if it can't find data for the event using the .co.uk URL.
Merge pull request #8 from theodi/bugfix-eventbrite-urls

Fix to pick up events with .com URLs in JSON