Many changes listed here.

- Removing taxonomy labels from this plugin, as these are generated automatically by WordPress.
- Adding taxonomy capabilities.
- Adding automatic capabilities for Administrators (all caps).
- Adding automatic capabilities for Administrators, Editors, Authors (editing caps).
- Adding filters for roles/caps associated with Redirects so that site owners may customize this functionality.
- Forcing `with_front` to FALSE on both the Post Type and the Taxonomy.