Return HTTP status 201 for created resources (#148)

Have the controller return status 201 for created resources, and have the client check for 201 response on created resources.

#143

controller/functionApi.go

@@ -77,6 +77,7 @@ func (api *API) FunctionApiCreate(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	w.WriteHeader(http.StatusCreated)
 	api.respondWithSuccess(w, resp)
 }