Remove liberator.dev’s dependency on compojure.

I believe this is a fix for liberator.dev's dependency on compojure. ( https://github.com/clojure-liberator/liberator/issues/103 )
This lets me use liberator.dev with bidi.
This should be a `(condp = subpath)`. AFAIK `case` uses identity for comparison which can fail for strings in some cases.