Just discovered this nice feature of RSpec where it can load all files for
us. Works with `bundle exec rake` and `bundle exec rspec spec/file_spec.rb`,
which covers all use cases.
This commit fixes#1647 and pretty prints strings in red instead of
green. This bug was introduced in https://github.com/pry/pry/pull/1586.
It will also continue to pretty print multi-line strings without a '+'
delimiter, per the same pull request.
