Add Islandora ThemeKey to your list of integrations

I don't have any knowledge about Islandora. But the implementation of function islandora_themekey_themekey_global() seems inefficient to me.
hook_themekey_global() is only meant for *really* simple properties, because they're populated on every page request.
But the somehow complex logic in your implementation should be moved to mapping functions which are only executed on demand.

Why is your module not mirrored on drupal.org?

Re-open this issue if https://github.com/mjordan/islandora_themekey/issues/6 is solved.