Make path to router script absolute in server shell.

Relative paths fail when you run the server from inside app/Console
or any other path.
Make paths platform dependent.

This fixes issues with the built-in PHP webserver on windows.

Fixes #3608
This commit is dedicated to Mark Story, who has put in much dedicated time and effort into CakePHP over the years.
I just wanted to ruin his evening, because this change needs to be merged into CakePHP 3.0.
Updated copyright date, added CSF address (Thanks Larry)
Formatted CSF address
Added extra line for referencing license file for copyright
Updated copyright and added references to license file for non-standard copyright references
Updated copyright
More copyright updates
Fix broken tests
Added some good practice rules from https://help.github.com/articles/ignoring-files to gitignore
Changed .gitignore to only ignore /app/Config/database.php instead of all files in /app/Config/ (helps to keep it in sync with its skel folder!)
Brought \app\ and \lib\Cake\Console\Templates\skel\ in sync
Fixed various @package annotations in \app\
Fixed various @package annotations in \lib\Cake\Console\Templates\skel\