Paged behavior on Collections

[mikeapp]

Original Issue
IIIF/api#1680

Issue
Behaviors such as individuals and continuous are valid at the Collection level, but paged is not.

Background
The paged behavior could be used to indicate that a Collection should be presented in a page-turning interface if one is available. For example, when a multivolume work is represented as a paged multi-part Collection, clients might provide a page-turning interface that can easily advance from one Collection member to the next.

Solution
Allow the paged behavior on Collections.

[azaroth42]

Issue 15 (Paged behavior on Collections)

+1: 25 [aisaac awead azaroth42 cubap gigamorph hadro irv jbhoward-dublin jonhartzler joshuago78 jronallo julsraemy jwd kzhr markpatton mcwhitaker mixterj regisrob rentonsa rsinghal scossu sredick tomcrane tpendragon zimeon]
0: 1 [jtweed]
-1: 0 []

Result: 25 / 26 = 0.96

Super majority is in favor, issue is approved