Update bkz.rb
Update bkz.R
Create google-books.rb
Update README.md
Updated bkz for --author & amazon book rank

I added --author for searching in amazon, it greatly improves accuracy and seems to work well. Still need to update for google books and good reads.

I also added amazon book rank, it only works on numbers >1million and I will need to fix it soon.
Updated amazon.rb for additional author option and book rank

Book rank is currently semi-broken and reports an amazon rank of zero for numbers less than 1,000 and greater than 1 million. There are currently 42 million books on amazon so that needs to be fixed.

The --author option seems to work well, currently no errors to report.
Merge branch 'master' of https://github.com/lettergram/bkz into lettergram-master.

Conflicts:
	amazon.rb
Fix issue with not matching less than 1k and more than 1m.
Tab a couple things.