Don't exclude vendor from RSpec's stack traces (#676)
Don't exclude vendor from RSpec's stack traces (#676)

This is why our stack traces in engine test failures are so unhelpful.
All we were seeing was the `rails_helper.rb` line, but nothing within
the engine.
tablexi/nucore-open,tablexi/nucore-open,tablexi/nucore-open,tablexi/nucore-open