change isbn schema plan
remove ratings from reviews in schema plan
one book per cover
installed devise, and generated a devise User model with a admin column
Added Devise views, and converted to HAML
added welcome controller
added _header haml layout, and updated the application layout to include a sign in / sign up
added a default admin to seeds, updated welcome index, and added two tests to user_spec
Merge pull request #46 from Mattsface/devise

Devise added with User model and Welcome controller
Merge branch 'master' of github.com:Rails-Summer-Project-Noah-and-Matt/Library-Application