V2 Wolf Tail

Wolf Tail is the second ever release of WP-Librarian. It features a complete restructuring of the plugin to mostly use classes. The sizeable functions.php file in the root directory was separated into the relevant functions for each post type's class (Items, Members, etc.). A final few function that should have been in helpers.php anyway were moved there. A bunch of small bugs were fixed and various bad ways of handling data were resolved.