Add unit test for Page::Navigator.
Improve input checking in Navigator. Raise an error if there's a problem.
Add logic to extract the nav block and get pagecount.

Extract the first nav block from the doc using a search for nav_last CSS class.
Add test body for post count.
Correct naming: use camel-casing (job_up instead of jobup).
Follow standard practice for naming of module files.

Use camel-casing and lower-case letters when naming module files. Really Shaun..you should know that by now :)