Include automatic testing configuration

[xredo]

• RSpec
• FactoryGirl
• Faker
• Database Cleaner
• Capybara & Poltergeist

[artero]

What test suite will be use RSpec or Minitest?

[xredo]

This is a discussion that we need to open. For now we can ask the user if he wants to use Rspec or Minitest, but in the future we will want to support only one system.

The problem is that we have not worked with MiniTest enough to have an answer.

[xredo]

We will use RSpec as the standard one.

[dvdgs88]

We can update to use selenium (the default in rails 5.1.4) and use system tests, consider possible issues with CI config #68 (https://medium.com/table-xi/a-quick-guide-to-rails-system-tests-in-rspec-b6e9e8a8b5f6)

[pablorc]

There's only still left the CircleCI + System tests integration. The rest is done in the branch enhancement/testing

[pablorc]

We are dropping CircleCI support and system tests in this issue. These features now have its own issues at #83 and #84