Created database tables books and users

Books table, title:string, author:string, user_id:integer. In book.rb, belongs_to :user.
User table, name:string, email:string, book_id:integer. In user.rb, has_many :books
And I ran bundle exec rake db:migrate.
Fixed the database

took off the book_id on users table.
Merge pull request #3 from stacybanks514/creating_databases_and_tables

Creating databases and tables