ReSpec and RDFa support

I have started the process of changing the RDFa support over to relying
upon the schema.org terms.  This is pretty straightforward.  Question: is
there any value in continuing to support the OLD terms as well?  In other
words, if conf.doRDFa is set to something (schema.org) then use RDFa 1.1
and schema.org terms.  Otherwise support the current behavior (which is a
hybrid of dublin core, bibo, and w3c terms).

-- 
Shane McCarron
Projects Manager, Spec-Ops