Fix deprecation warnings in cucumber tests.
Fix deprecation warnings in cucumber tests.

One advantage of running cucumber tests with a format less noisy than the default is that deprecation warnings like this are more obvious :-

    features/step_definitions/topic_steps.rb:88:in `block in <top (required)>': #tableish is deprecated and may be removed in the next major version. Use Capybara::Node::Finders instead.

    features/step_definitions/topic_steps.rb:94:in `block in <top (required)>': #tableish is deprecated and may be removed in the next major version. Use Capybara::Node::Finders instead.

YOTOV-LIMITED/whitehall,askl56/whitehall,alphagov/whitehall,YOTOV-LIMITED/whitehall,askl56/whitehall,alphagov/whitehall,robinwhittleton/whitehall,ggoral/whitehall,YOTOV-LIMITED/whitehall,hotvulcan/whitehall,askl56/whitehall,robinwhittleton/whitehall,askl56/whitehall,alphagov/whitehall,hotvulcan/whitehall,alphagov/whitehall,ggoral/whitehall,robinwhittleton/whitehall,ggoral/whitehall,hotvulcan/whitehall,hotvulcan/whitehall,robinwhittleton/whitehall,ggoral/whitehall,YOTOV-LIMITED/whitehall