Image as inline vs. block

[dylans]

I'm not sure of a great solution, but I think the ast that gets generated doesn't work well for an image if it is an inline element vs. a block.

Perhaps it should get fixed via normalization, but I think for inline it's probably ideal to have an image element have an empty text element before and after. Perhaps this could be handled via a mode, or perhaps there's a good way to infer it from usage.

[newtmex]

Remark-slate defaults to generating AST with the image as inline. I can't figure how to make it generate it as block.

[hanford]

We may want to introduce a new mode or expose an option to enable that. I don't have a strong preference as I don't have any images in the editor that I use!