with examples updated
roll back, toploop hang on when ;; is used
updated example
with new lexers
with api changed ...
remove some create_lexer
subtle bug -- parse_string should be parameterized by lexer -- in the future, we should not make it optional..
remove create_lexer for lex_lex
remove creat_lexer for grammar
clean the api for gramf
Merge branch 'not_check' into not_check_no_lexer_filter

Conflicts:
	src/common/tokenf.ml
no filter any more!! fast lexing