Create an image driver

[nfroidure]

The idea is to map this class https://github.com/Rest4/Rest4-php/blob/master/php/class.image.php to a Rest driver looking like it:

/images/path/to/image/filename.png?width=n&height=n&pack=true&quality=n&background=#fff

Images must be cached using their own filesystem based cache.

[nfroidure]

• /image/public/images/photos/me.png?w=200&h=100&mode=preserveratio|fill&cropx=0&cropy=0&cropw=0&croph=0&background=000000|transparent&centerx=0&centery=0