Revert "Use raptor_normalize_language to normalize N-Triples and Turtle inputs"

This reverts commit 74e9fc1160cbb300cb87445bebcca4033a627e56.

Conflicts:
	src/turtle_lexer.l
Revert "(raptor_normalize_language): Added to normalize to en-US-BLAH"

This reverts commit 7b4788f656546be7abdd87122c03ea005e771c17.