Documentation update for API 2.0.0.0

The namespace is now Microsoft.WindowsAzure.Storage, and the static method CloudStorageAccount.FromConfigurationSetting no longer exists in the latest API, so Parse (or ideally TryParse) should be used instead

Source: http://msdn.microsoft.com/en-us/library/windowsazure/microsoft.windowsazure.storage.cloudstorageaccount_members.aspx

**This is a redux of my previous pull request so that it could come from my branch for it, rather than master**