Split feature tests out to different build job

.travis.yml

lib/tasks/spec.rake

spec/features/admin/admin_hooks_spec.rb

spec/features/admin/admin_projects_spec.rb

spec/features/admin/admin_users_spec.rb

spec/features/admin/security_spec.rb

spec/features/atom/dashboard_issues_spec.rb

spec/features/atom/dashboard_spec.rb

spec/features/atom/issues_spec.rb

spec/features/gitlab_flavored_markdown_spec.rb

spec/features/issues_spec.rb

spec/features/notes_on_merge_requests_spec.rb

spec/features/profile_spec.rb

spec/features/projects_spec.rb

spec/features/search_spec.rb

spec/features/security/dashboard_access_spec.rb

spec/features/security/group/group_access_spec.rb

spec/features/security/group/internal_group_access_spec.rb

spec/features/security/group/mixed_group_access_spec.rb

spec/features/security/group/public_group_access_spec.rb