move Token and Tokens into Tokenizer subnamespace
minor #569 move Token and Tokens into Tokenizer subnamespace (keradus)

This PR was squashed before being merged into the 1.0.x-dev branch (closes #569).

Discussion
----------

move Token and Tokens into Tokenizer subnamespace

move Token and Tokens into Tokenizer subnamespace

extracted from #553

Commits
-------

18f0dd4 move Token and Tokens into Tokenizer subnamespace
Merge branch 'master' of git://github.com/fabpot/PHP-CS-Fixer