Improved image handling

[ieure]

It would be terrific if there was a better way to attach images (or whatever) to posts.

• Support for org attachments. This is the flow I use for most of my own things. Org-page ignores the files.
• Support for bundling all parts of a post into a directory. ex. instead of creating blog/post-title.org and blog/random-image.jpg -- which aren't obviously linked in any way -- you could make blog/post-title/post.org and blog/post-title/random-image.jpg. The unlinked image/text is a thing that's annoyed me about several blogging systems.

You could probably do both of those, since org attachments go into a data directory relative to the org file the things are attached to. This would rock.