Add variables support in the view.

Signed-off-by: Florian Wininger <fw.centrale@gmail.com>
Add PicturesHelper controller.

This controller is used as a interface to help with the shared pictures.

Signed-off-by: Florian Wininger <fw.centrale@gmail.com>
Add PicturesDisplay abstract controllers.

This controller is used to display a picture in the browser.

Signed-off-by: Florian Wininger <fw.centrale@gmail.com>