[sandbox] yearbook pagination

[tcmann]

yb pagination fails when you've squelched someone in the 56 most recent yb uploads. Most likely looking at yb calling the first 56 imgs and then only loading those minus squelches and thinking "oh, there's only 55 or whatever, no need to paginate!"

[numist]

this is going to be fixed by the same code that fixes Issue #24, so this is some kind of dupe.