[WM] throw a better error msg when no config.edn found

I got tired of remembering that "java.lang.IllegalArgumentException: No implementation of method: :make-reader of protocol: #'clojure.java.io/IOFactory found for class: nil" usually means resource-config wasn't finding a config.edn file.
[WM] throw FileNotFoundException when config.edn missing
Merge pull request #3 from turbovote/better-error-msg

[WM] throw a better error msg when no config.edn found