Added ServerShell for PHP Built-in Server into 2.3 branch.

[shin1x1]

This pull request is from #713 .

Hi, I would propose adding new Shell Command.It is ServerShell.

ServerShell provides a httpd server for CakePHP application without other httpd server(Apache, nginx etc).

It is use PHP CLI build-in server.

Use case is below.

1. default (http://localhost/)

$ cd /path/to/app
$ ./Console/cake server

Welcome to CakePHP v2.3.0-dev Console
---------------------------------------------------------------
App : app
Path: /path/to/app/
DocumentRoot: /path/to/app/webroot
---------------------------------------------------------------
built-in server is running in http://localhost/

2. specify ListenPort (http://localhost:8000/)

$ ./Console/cake server -p 8000

Welcome to CakePHP v2.3.0-dev Console
---------------------------------------------------------------
App : app
Path: /path/to/app/
DocumentRoot: /path/to/app/webroot
---------------------------------------------------------------
built-in server is running in http://localhost:8000/

3. usage

$ ./Console/cake -h

Welcome to CakePHP v2.3.0-dev Console
---------------------------------------------------------------
App : app
Path: /path/to/app/
DocumentRoot: /path/to/app/webroot
---------------------------------------------------------------
PHP Built-in Server for CakePHP
[WARN] Don't use this at the production environment

Usage:
cake server [-h] [-v] [-q] [-H] [-p] [-d]

Options:

--help, -h           Display this help.
--verbose, -v        Enable verbose output.
--quiet, -q          Enable quiet output.
--host, -H           ServerHost
--port, -p           ListenPort
--document_root, -d  DocumentRoot 

4. PHP 5.3 or lower

$ ./Console/cake server

Welcome to CakePHP v2.3.0-dev Console
---------------------------------------------------------------
App : app
Path: /path/to/app/
DocumentRoot: /path/to/app/webroot
---------------------------------------------------------------
This command is available on PHP5.4 or above    

[lorenzo]

Looks good to me, what do the others have to say about this?

[shama]

LGTM. Nice work @shin1x1!

[jrbasso]

I like it! But has some code standards issues, please run the phpcs to fix them.

[shin1x1]

@jrbasso thanks! I fixed phpcs errors.

% phpcs --standard=CakePHP lib/Cake/Console/Command/ServerShell.php
Time: 1 second, Memory: 3.75Mb

[markstory]

So is this ready to merge in? It looks pretty good to me.

[shin1x1]

yes, it's ready to merge.

[lorenzo]

Looks good to me