Clojurians Log v2

thanks for the merge. one more idea I had is to improve the async testing story. the cljs.test async macro now has support for async/await. we can just document this:

(deftest foo
  (async done
    (try 
      (let [x (await 10)] ...)
      (finally done)))

(deftest ^:async foo
  (let [x (await 10)] ...))

yeah, something to think about