Add preliminary booklist create and show
Add booklist partial and fixed booklist deletion
Fix user booklist creation when errors
Add create/destroy booklist specs
Fix relationship between User and Book

Removed Booklist model, controller, and specs. Book changed booklist_id
reference to user_id. User and Book specs updated accordingly.
Remove booklist form and factories helper
Implement book create
Implement book destruction and fix Book spec factories
Style book entry form