Housekeeping

- Renamed flipboard setup func in script.js to setupFlipboard
- setupFlipboard is now called from main()
Housekeeping

- Removed duplicate class .elastic (re-used .contain-width)
Slight improvement around the 2012 edition text (+ a lengthier placeholder)
Fixed erroneous closing tags.
Added a 'Buy Tickets' button to the opening banner.
Refactored .bio-columns to .thumbnail-columns to facilitate better re-use
Refactored .videos-2012 to re-use .thumbnail-columns