Auto generate lanyrd event info based on lanyrd event link in individual post variable

Heads up!

This update should simplify creation of new event posts. I have centralized lanyrd event information into the `lanyrd` variable on each post and am now auto generating the always present lanyrd widgets based on that. Take a look at the updated december 2013 event post to see the new convention.

@copenhagenjs/owners