#130 - move backup_controller to rails.new

java_imports has this commented: #java_import com.thoughtworks.go.domain.config.Admin unless defined? com.thoughtworks.go.domain.config.Admin
added empty app/views/index.html.erb, app/views/admin/backup/index.html.erb & app/layouts/admin.html.erb. will move it next.
application_controller_spec is not moved yet. will move it soon.