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* Re-order migration guides so newest is at the top.
* Add 2.3 guide.
merge new features and migration guide docs.
Having 2 places for changes made it harder to figure out what
Merge branch 'master' into 2.1
Updating migration guide for 2.1
Adding toctree entry.
Removing now-invalid toctree entries.
Adding links and <?php tags so code is highlighted.
Adding a glossary for ideas used all over CakePHP
Renaming source -> en.
Starting to make multi-lang directories.