Setup for Mac OS:
-Get a version of ruby on machine use preference -RVM(ruby version manager) or (rbenv.) Use ruby 2.3.3
-In terminal Install 'homebrew' (document https://brew.sh/)
-In terminal brew install 'geckodriver' for the firefox browser (default) brew install 'chromedriver' for the chrome browser
-To install bundler (gem dependencies manager), open the terminal and run (documents http://bundler.io/) 'gem install bundler'