move mixsegment from segment.cpp into mix_segment.h/cpp and utils.h
add query_segment.cpp/h
update testing in package.json
update readme.md
update changelog.md and tag
add threshold as the arg of queryLoadDict
add v0.2.2
update cppjieba for reducing the memory cost
update v0.2.3
there is a bug in git ? it seems that git can not distinguish logger and Logger.