Implemented basic ECHAR/UCHAR escaping in the N-Quads serializer.
Implemented basic ECHAR/UCHAR escaping in the N-Quads serializer.

bxshi/librdf,dirvine/librdf,datagraph/librdf,dirvine/librdf,bxshi/librdf,dirvine/librdf,datagraph/librdf,bxshi/librdf,datagraph/librdf