Big Pagination update.
- Added support for page numbers in route parameters, as opposed to the query string.
- Created current_page config setting for setting both the source (query or route) and the key for the page number location.
- Created $config property for storing config settings in their own space. Much cleaner.
- Renamed some methods to more descriptive names: load_config -> config_group, config -> setup.
- Removed $cache parameter from config_group.
- Removed $auto_hide parameter from render.
- Updated demos.