modman-root-dir and skip-package-deployment

HI everybody,

I was looking for a nice way to get rid of git submodules (although I started like them somehow) and using composer for "wiring" my Magento projects. I'd really like to keep my classic project structure where modman packages go to ".modman". Also I'll have some other tools, that I will want to install somewhere else (e.g. n98-magerun to "tools"), and of course the Magento source needs to go to "htdocs". So I looked how to make composer install packages into custom folders and saw the vendor-dir and the target-dir options. Both still don't do exactly want I images in the default Installer. I saw that this project is adding a Magento Installer anyways so this looks like a clean solution at least for managing the Magento Modules part.
However the php port of modman doesn't handle the new module location very well, so I decieded to add an option to skip deploying at all. Also I think the untill the php solution is rock-solid I'll still prefer using Colin's script (this doesn't mean that I think a pure PHP solution wouldn't be awesome :)

Cheers,

Fabrizio