remove unused test gemfiles

gemfiles/Gemfile.base-versions

@@ -1,21 +0,0 @@
-source "https://rubygems.org"
-
-gem 'bundler', '~> 1.0'
-gemspec :path => '..'
-
-gem 'xpath', '~> 2.1.0'
-
-gem 'rack', '~> 1.6.0'
-gem 'rack-test', '= 0.6.3'
-gem 'nokogiri', '= 1.6.7'
-gem 'rspec', '= 3.4.0'
-gem 'cucumber', '= 2.3.0'
-gem 'mime-types', '= 2.0'
-gem 'addressable', '2.4.0'
-gem 'json', '< 2.0'
-gem 'rake', '< 11.0'
-
-# We cannot test against older versions of selenium-webdriver without
-# installing older compatible Firefox versions.
-gem 'selenium-webdriver', '< 3.0.0'
-gem 'term-ansicolor', '< 1.4.0'

gemfiles/Gemfile.ruby-20

@@ -1,9 +0,0 @@
-source 'https://rubygems.org'
-
-gem 'bundler', '~> 1.1'
-gemspec path: '..'
-
-gem 'xpath', '~>2.1'
-gem 'nokogiri', '< 1.7.0' # 1.7 requires ruby 2.1+
-gem 'rack', '<2.0' # 2.0 requires ruby 2.2+
-gem 'public_suffix', '<3.0' #3.0 requires ruby 2.1+