Fixes issue #12 (as well as possible given mismatch between CMFBibAT and collective.citationstyles; see issue for comments):

Finds bibliography item iterator via multiadapation (context, request) now, so it's possible for integrators to provide their own iterator more easily by provider marker interfaces on request.

Fixes bug in JS that broke pages 2+ of batched sets and had JS error on page 1. Now, if item provided by iterator not found in produced-by-template HTML, it is silently omitted.