Merge pull request #31 from kevinl95/master

Updating setup.py to resolve 'AttributeError: 'ParsedRequirement' object has no attribute 'req''

Merge pull request #27 from jpeacock29/master

Upate csv test

Fix bug with selecting next page; consolidate extraction code

Extract all prices and identify unit prices, dropping old price extraction code; generalize URL css selector; improve handling of missing values

Refactor to improve testability of scraping

Refactor price extraction code and make price extraction more flexible

Add unit price extraction and fix bug in price extraction

Make csv writer more flexible to include price etc; keep record of all HTML pages; add more logging

Remove user agent

Update CSS selectors for price, title, average rating and number of ratings; add comments; simplify logic

Fix for the search url change (https://www.amazon.com/s/field-keywords=XXX => https://www.amazon.com/s?k=XXX) + next_page_url selector

added price

added price