(raptor_stringbuffer_append_turtle_string): Handle Turtle 2013 \-escapes
Fixes for debugging bison
Switch to use LANGTAG for language tag
Fix Turtle 2013 lexing rules
Tidy and report number of errors
(raptor_qname_string_to_uri): Handle qnames with two :s

Need to handle ':foo:...' QNames; just care about first ':'
Turtle tests bad-15, bad-21 and bad-22 are good for Turtle 2013
\.
Support 'single' quotes
Support '''single long''' quotes
Added turtle_expand_name_escapes for expanding escapes inline
ws
Report error counts and failing tests
Replace QUOTEDURI with Turtle 2013 IRI allowing u-escapes