fixes check_format
fixes download url
fixes cmake url
update binary file format version

as gb_char.table and gbk_char.table has been updated.
fixes pinyin_iterator_add_phrase
update lambda
use model4.text.tar.gz
bump version 0.8.92
update lambda
use model5.text.tar.gz
fixes pinyin.h
add back pinyin_clear_constraint
re-factor pinyin_custom2.h
bump version 0.8.93
bump version 0.9.91