events.jquery.org: Style upcoming events on homepage
All sites header: Dynamically show upcoming events
events.jquery.org: Remove row nesting in upcoming events grid
events.jquery.org: Styling past events grid

Modifies the creation of the past events array so that it's an array of arrays keyed by year
events.jquery.org: Update events logo, use Foundation theme
events.jquery.org: Add homepage banner
All sites header: Adjust so ads don't touch main content area

This has been bothering me for quite some time and while not directly germane to this branch, it seems a good moment to tweak this, as many of the ads (especially those that look odd) are for our events.