[Testing] turbo tests & [html-xml-css-manipulation] Nokolexbor

[dimitryzub]

Turbo tests

Github: https://github.com/serpapi/turbo_tests Rubygem: https://rubygems.org/gems/turbo_tests

Allows to run RSpec tests on multiple cores. Like parallel_tests but with incremental summarized output.

Nokolexbor

Github: https://github.com/serpapi/nokolexbor Rubygem: https://rubygems.org/gems/nokolexbor

Difference from Nokogiri:

Meant to be a drop-in replacement for Nokogiri. 5.2x faster at parsing HTML and up to 997x faster at CSS selectors than Nokogiri.

P.S. Sorry, I've screwed a few things and closed #108 PR to avoid duplicating.