unify object load/unload and loaded methods
deprecate attached()
correct the doc block
Add .editorconfig file.

Config file to help define the code style for supported editors and IDEs.
http://editorconfig.org
refactor uuid checks into a method
making uuid field check protected
rename the method and fix docblock return type
Clean up code.

* It is not need to check the same thing twice
* One if condition instead of two ifs
* Ternary codition instead of checking if variable is null
* Returning early to avoid unnecessary conditional levels
* It is not needed to put an else as the if before already has returned
* Changing ternary conditional to PHP 5.2
* Removing some not needed conditions in the if, also changed to return false (instead of NULL) to follow the code block docs
* Changing to check before if the class_exists so we make sure that class was autoloaded before the condition

Squash of commits in https://github.com/cakephp/cakephp/pull/1034
Merge branch 'krolow-code-review' into 2.3

Fixes #GH-1034
Merge pull request #1036 from dereuromark/2.3-cleanup

code cleanup
Merge pull request #1001 from dogmatic69/refactor-uuid-checks

Refactor uuid checks into a method
a few more application contents should send the charset
adding content type tests as dataprovider
Update lib/Cake/Model/Model.php

Corrected an unlogic link from Model:find to an appropriate page in the docs
Merge pull request #1038 from ravage84/patch-1

Fix manual link
fix whitespace errors
phpcs violations will now fail travis builds
Added "required" attribute to input element based on validation rules for field
Added support for php.ini style values
Merge pull request #1042 from ADmad/2.3-cakenumber

Added support for php.ini style values
Update doctypes to html5