Added :refer-clojure :exclude for promise for actors namespace

[ekarlsso]

When referring to co.paralleluniverse.pulsar.actor I get following error message:

IllegalStateException promise already refers to: #'co.paralleluniverse.pulsar.core/promise in namespace: co.paralleluniverse.pulsar.actors clojure.lang.Namespace.warnOrFailOnReplace (Namespace.java:88) and the loading fails.

Used namespace declaration is following:

(ns ptest
  (:refer-clojure :exclude [promise])
  (:require [co.paralleluniverse.pulsar.core :refer :all] :reload
               [co.paralleluniverse.pulsar.actors :as a] :reload))

The error message doesn't happen if only accessing pulsar.core.

After adding the (:refer-clojure :exclude [promise]) to actors namespace the problem doesn't appear anymore.

Probably this happens because actors namespace refer pulsar.core :all.

[pron]

Thank you very much!