patches with some new features

[Jan K. <jan...@ja...>]

Hi PHP Shell people,

PHP Shell didn't do what I wanted it to do, so I made some modifications.
Among others: a 'download' command and better cd handling. See
https://bitbucket.org/JanKanis/phpshell for all changes. (check the
'default' branch, not the one 'tip' is pointing to).
So, could someone merge my updates in, or otherwise can someone make me part
of this project so I can add the stuff myself? My sf username is jankanis.

- Jan