configure database_cleaner in features/support/env.rb and spec/spec_helper.rb; give email autofocus in sessions/new; give studios, jobs and groups default scope of id ASC; move studio and/or job creation & variable assignment to before(:all) block, destroy studio and/or job in after(:all) block in job_pages_spec and grou_pages_spec to avoid order-dependency errors when running rspec on whole suite