Allow \b \f escapes in Turtle strings
Use N-Triples 2013 mime type
Always allow UTF-8 in N-Triples strings and URIs (N-Triples 2013)

(raptor_ntriples_term): Remove allow_utf8 arg and always set it true.
Make N-Triples allow writing \b and \f
Normalize N-Triples expected output before comparing them with diff
Report normalize N-Triples diff
Added missing literal_with_escaped_BACKSPACE.nt
Turtle test for lang and datatype warning is now an error

Renamed test-35.ttl to bad-24.ttl
(raptor_normalize_language): Added to normalize to en-US-BLAH
Use raptor_normalize_language to normalize N-Triples and Turtle inputs