go back to old json
email link cleanup
html validation tweaks
track tag combos
recenter 2013 link
fade out manicule faster
account for slugs that are links
use filter when toggling grid, closes #198
fix responsive ad
move browse link into list
refine next/last to avoid reverse looping errors when filter is active
url encoding share email one too many times
better review event tracking
final analytics cleanup
smarter covers/list toggle
use isbn13 for indie bookseller