moving Silva Image to a extension

[Jan-Wijbrand Kolman]

We might want to consider moving Silva Image (with all of its manipulation
functionality etc.) into a seperate Silva Extension, and keep a very lightweight
image asset in the core. That way we can safely depend on PIL for this
extension, where the core's dependencies are kept to a minimum.

(A cool idea, that's actually Martijn's :)

This might also relate to the existing ideas on refactoring the assets in Silva.

[Christian Zagrodnick (zagy)]

This sounds like a very good idea! The image asset is sort of ... strange due to
the automatic degrading.

[Sylvain Viollon (thefunny)]

This is core feature that is used by everybody. Lot of code in Silva have already been refactored. With a bit more work we could rename it to silva.core.content (base classes) and silva.app.content (actual content, link, image, toc, ghost).