add word update
fix unit test
Merge pull request #25 from shimokitabenbot/add_word_update

add word update
add not found
Merge pull request #26 from shimokitabenbot/add_word_update

add not found
fix bug
Merge pull request #27 from shimokitabenbot/fix_bug

fix bug
modify revision file
Merge pull request #28 from shimokitabenbot/develop

Merge to master