Now supports the Tuque interface required for Fedora 4 development.

Changes have been localized to the tuque wrapper objects which now
extend wrapper objects that tuque provides for each version of fedora.

All of these pull request should be merged at once:
https://github.com/Islandora/tuque/pull/77
https://github.com/Islandora/islandora/pull/426
https://github.com/Islandora/islandora_paged_content/pull/37