Implemented all of the reading materials controller related code
Swapped the isbn's over to being strings
Added the book creation related code
Changed the books_controller to not have validations wired up yet
Layed out the tests we want for a Book
Wrote first failing test
Name confirmation validation passed
Implemented the tests for the name precense validations
Implemented the uniqueness validation tests
Wrote the last of the failing unit tests
Implemented the format validation for Book#isbn
Added invalid data features
Added the markup for displaying form validation errors
Added validations to the controller
Added the connections between a BookShelf and Book
Added the test for BookShelf's has_many association
Merged in week7