The render code path would use a fallback if there was an exception.
This change instead relies on explicit declaration of the layout to use
and includes a check to see if the layout indeed exists before
attempting to render it.
Allow content that is not markdown and does not need to be rendered to
exists in the content directory. Currently any valid html or xml
document can exist. Templates are applied to these documents as well.
If you need to have content that doesn't have templates or AbsUrlify
like operations, then continue to put this content in static and it will
be copied over.
