update migration guide
Merge pull request #1694 from antograssiot/3.0

3.0 - Move Utilty\Number to I18n\Number
update code example
Merge pull request #1695 from cakephp/fix-security-docs

Fix incorrect callback method signatures.
Updated Creating Helpers

Slight tweak to make sure the create example extends Helper, rather than AppHelper.
Merge pull request #1696 from crot4lus/patch-1

Updated Creating Helpers
update AppHelper example
remove AppHelper
Merge pull request #1698 from cakephp/3.0-helper

3.0 update AppHelper example
Fix argument type in method signature.
Merge pull request #1693 from elboletaire/blog-spanish-fixes

Removed uncomplete note + fixed `Getting CakePHP` part
Fix spelling and grammar under Testing Views
Fix let's under Testing Components
Underscore prefixed methods no longer treated as private.
update Number class
update NumberHelper
update example with `MessageFormatter`
Merge pull request #1699 from cakephp/3.0-underscore-prefixed-methods

Underscore prefixed methods no longer treated as private.
[fr] refresh code-generation-with-bake file

follow en version
Merge pull request #1680 from Agence-MMK/patch-2

Update query-builder.rst