Merge branch 'release-0.55.0' into develop

* release-0.55.0:
  Bumping version to 0.55.0
  Update models to latest version
Update models to the latest versions
Update signature version test suite to handle double urlencoding
Bumping version to 0.56.0
Merge branch 'release-0.56.0'

* release-0.56.0:
  Bumping version to 0.56.0
  Update signature version test suite to handle double urlencoding
  Update models to the latest versions