Squashed 'bogo/' changes from c815ff7..24c77d5

24c77d5 Add tests
07fdbba _accepted_chars() accepts Vietnamese characters with tone and mark as well

git-subtree-dir: bogo
git-subtree-split: 24c77d5df6e84092968ecac3f86949d878e4b698
Merge commit '2ee858280009835ecfe72e147783feddacfe7897'
Merge pull request #27 from lewtds/latest-bogo

Pull in latest changes from bogo-python