3.0 add cakephp-codesniffer to require-dev

This is a good way to easily check for cs with PHP standard without the overhead of using pear.

it allows to use `vendor/bin/phpcs --standard=CakePHP` as stated [here](https://github.com/cakephp/cakephp-codesniffer).

Also easier in my opinion to keep up to date with latest changes.
Also packaged releases can be installed from composer internal cache

2014-09-29 14:20 GMT+02:00 Mark Story <notifications@github.com>:

> In composer.json:
>
> > @@ -28,7 +28,8 @@
> >  		"psr/log": "1.0"
> >  	},
> >  	"require-dev": {
> > -		"phpunit/phpunit": "*"
> > +		"phpunit/phpunit": "*",
> > +		"cakephp/cakephp-codesniffer": "dev-master"
>
> Packaged releases are quicker to download too.
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/cakephp/cakephp/pull/4760/files#r18149930>.
>