Fix Rails 4.2 build

Author: rmosolgo

gemfiles/rails_4.2.gemfile

@@ -7,6 +7,7 @@ gem "ruby-prof", platform: :ruby
 gem "pry"
 gem "pry-stack_explorer", platform: :ruby
 gem "rails", "~> 4.2", require: "rails/all"
+gem 'loofah', '~>2.19.1' # Trying to fix Nokogiri incompatibility
 gem "activerecord", "~> 4.2.4"
 gem "actionpack", "~> 4.2.4"
 gem "concurrent-ruby", "~> 1.0"