Add commandline parse.

It helps to have a shell command to run the parse to learn from it. 

Just run `$ php bin/parse.php bin/parse.php`

My use for now is `$ php bin/parse.php bin/parse.php | sort -u` to learn from its 'roots' from last lines like

````
    [0] => PhpParser\Node\Expr\Include_ Object
    [1] => PhpParser\Node\Expr\FuncCall Object
    [2] => PhpParser\Node\Expr\Assign Object
    [3] => PhpParser\Node\Stmt\If_ Object
    [4] => PhpParser\Node\Expr\Assign Object
    [5] => PhpParser\Node\Expr\FuncCall Object
    [6] => PhpParser\Node\Stmt\Foreach_ Object
    [7] => PhpParser\Node\Stmt\Foreach_ Object
```