RecursiveDitto processor doesn't maintain the ProcessorContexts

[leekelleher]

If a processor returns an IPublishedContent, then the recursive processor (one of the default post-processors) will make an .As() call, but it doesn't pass in current DittoProcessorContext objects. This pull-request aims to resolve this.

@mattbrailsford Are you happy with the processor contexts being passed through to GetPostProcessorAttributes()?

[mattbrailsford]

Yup