Merge branch 'release/v0.7b'
Merge branch 'release/v0.7.1b'
Merge branch 'release/v0.7.2b'
Merge branch 'release/v0.7.4b'
Merge branch 'release/v0.8.1b'
Merge branch 'release/v0.8.4'
Merge branch 'develop'
ドキュメント調整
ドキュメント更新