backend.rb in serverspec-0.9.0

- old
+ new

@@ -1,2 +1,7 @@
+require 'serverspec/backend/base'
 require 'serverspec/backend/ssh'
 require 'serverspec/backend/exec'
+require 'serverspec/backend/powershell/script_helper'
+require 'serverspec/backend/powershell/command'
+require 'serverspec/backend/cmd'
+require 'serverspec/backend/winrm'