Merge branch 'hotfix/update_gem_to_0.2.20' into develop

* hotfix/update_gem_to_0.2.20:
  update gem
Merge branch 'hotfix/update_gem_to_0.3.0' into develop

* hotfix/update_gem_to_0.3.0:
  update gem
  add deutsch
  update gem
update gem
Merge branch 'hotfix/update_gem_0.3.3'

* hotfix/update_gem_0.3.3:
  update gem
Merge branch 'hotfix/update_gem_0.3.3' into develop

* hotfix/update_gem_0.3.3:
  update gem
Merge branch 'release/0.4.6'

* release/0.4.6: