Small prod updates

[frankduncan]

What it says on the tin :)

[kfogel]

The fact that this is in a file named CollectionAjaxFunctions.php makes me feel weird about just changing the path component from "Collections" to "SimpleBook". I mean, if this is just a quick change to get something that can be rolled out to production right away, then I get it, but let's file a ticket about doing a more thorough adjustment later.

(Hunh. I made this comment directly on the particular commit that was about the image path being hardcoded, but somehow my comment ended up being associated with the overall PR? Thanks, GitHub?)

[slifty]

@kfogel agreed in essence. There is already an issue about moving away from Collection (#25) and I think your concern applies to that / I've now linked your comment to that issue.

There is a lot of tech debt in this plugin right now, and it needs some focused gutting.

We shouldn't rename files right now, as that is part of the larger required refactor and I think that a half step is more likely to cause trouble and confusion in the short term.

[slifty]

Worth noting here as well that we all know this is a patch and that ideally these assets would not be hardcoded with the plugin name. It's not obvious the "right" way to do that, so this is a fine solution in the mean time!