Syndetic AC: Add more review sources with comments

Syndetic AC: Add more review sources with comments

* Add more Syndetic review sources (commented out)
    Add additional Syndetic review sources, commented out
    for performance reasons -- each source represents a distinct
    request from the server to the AC provider, and we currently
    lack a means of configuring which are on/off, short of
    commenting / uncommenting.

* Add comments for Syndetics review sources
* Fix file name for School Library Journal reviews, add New
    York Times reviews.

Signed-off-by: Jeff Godin <jgodin@tadl.org>
Signed-off-by: Lebbeous Fogle-Weekley <lebbeous@esilibrary.com>