add pg gem and change db to postgres
add 20 books to data, now create task to read
build rake task to scrape book data
rake task almost finished, add hirb gem
add root to routes
title, author and price now working
use css selector instead of xPath
title, author, price, isbn and shipping all working except book #6 (isbn), #12 (isbn) and #20 (weight)
show page displaying information of each book