Proof a few more chapters for flagrant errors.
Proof some more sections for flagrant errors.
Add file name

First I was thinking if we do 
src/Model/Table/ArticlesTable.php
src/Controller/ArticlesController.php

In entities we do the same and...
src/Model/Entity/ArticlesEntity.php

But this is wrong.
It should be Article.php and this is not written in "Creating entity classes", so I included the file name to be easy to understand. I followed the pattern found in line 295.
Merge pull request #1536 from Hikkijp/patch-3

Add file name for easy understanding
Update helpers.rst

Just added $event for the beforeRender method for newbies and consistency throughout the docs. Otherwise, it throws errors and some people may not know why if the docs are shown without it.
Merge pull request #1537 from rightnowweb/patch-8

Update helpers.rst
App::themePath() is no more.
Fix lies.

Replacing Core classes is more tricky now as namespaces make it much
harder to shadow a class name. However, each section show you how to
load aliased objects. For example loading aliassed helpers.
Merge pull request #1538 from cakephp/3.0-more-proofing

3.0 more proofing
Update inflector docs.
Update Number docs.

So many wrong examples :/
Update Router and Security chapters.

Remove many of the now removed methods in Security. Make rijndael
undocumented as encrypt() is better.
remove extra link to FlashHelper
Merge pull request #1541 from antograssiot/patch-1

3.0 doc remove extra link to FlashHelper
Fix typos and grammatical errors.
Merge pull request #1542 from cakephp/3.0-proof-round3

3.0 Another block of proofing