Move body class functionality to separate file.
Add helper functions for getting post types, taxonomies and checking if on a single post type page.
Add menus module and 'extraclasses_menu_item_class' filter for easier filtering of menu item classes.
Convert ExtraClasses to an abstract class.
Code formatting and documentation.
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Add Menu Selector class.
Version 0.2
Add Menu Selector class inline documentation.
Remove unused Menu module - superceded by Menu Selector module.
Declare methods as public.
Add docblock.
Use self:: for internal static class references.