Part1-Scenario:Admin can merge article | Add path for Edit Page of Article with id No.
Part1-Scenario:Admin can merge article | Add 'Merge Articles' to _edit.html.erb
Part1-Scenario:Admin can merge article | Completed: Add 'merge_with' to models/article and admin/content_controller
Part1-Scenario:A non-admin cannot merge articles | Completed
Part1-Scenario:The merged articles should contain the text of both previous articles | Add scenario to feature/merge_articles
Part1-Scenario:The merged articles should contain the text of both previous articles | Completed : Add step to feature/step_definitions/article_steps