Suggestion: add if-last

Hello,

I’ve realised that it’d be extremely useful to have an ‘if-last’ tag, especially to make custom by-date grouping.

I’ve created a Gist for you that adds this functionality. I’d be great if I could see it in the next release!

https://gist.github.com/anonymous/7649521

http://wordpress.org/plugins/google-calendar-events/