Moved the forms for manipulating multiple pages here from book/newspaper.

This file was basically the same in both the book solution pack and the
newspaper solution pack. Now any object that contains "page" objects,
can resuse and extend these forms.
Added page navigator theme function.
Merge pull request #14 from nigelgbanks/7.x-manage-pages

7.x manage pages
Merge pull request #1 from Islandora/7.x

7.x update
7.x grammar fixes
Merge pull request #15 from daitken/7.x

7.x grammar fixes