have clojure-ns accept class names without $

When using aleph in combination with ring's wrap-stacktrace, certain
exceptions are silently swallowed by the server.  I traced this down
to clojure-ns raising a null pointer exception for the class-name
"lamina.core.observable.ConstantObservable", which is a defrecord.

This changes clojure-ns to return "lamina.core.observable" as the ns.
clojure-fn is unchanged and returns the full string, which is probably
wrong.
have clojure-ns accept class names without $

When using aleph in combination with ring's wrap-stacktrace, certain
exceptions are silently swallowed by the server.  I traced this down
to clojure-ns raising a null pointer exception for the class-name
"lamina.core.observable.ConstantObservable", which is a defrecord.

This changes clojure-ns to return "lamina.core.observable" as the ns.
clojure-fn is unchanged and returns the full string, which is probably
wrong.

@@ -11,7 +11,8 @@
 (defn- clojure-ns
   "Returns the clojure namespace name implied by the bytecode class name."
   [class-name]
-  (utils/re-gsub #"_" "-" (utils/re-get #"([^$]+)\$" class-name 1)))
+                              (utils/re-get #"(.+)\.[^.]+$" class-name 1))))
 
 ;; drop everything before and including the first $
 ;; drop everything after and including and the second $

@@ -40,6 +40,11 @@
     {:clojure true :ns "user" :fn "eval"
      :file nil :line nil :anon-fn false}]
 
+   ["lamina.core.observable.ConstantObservable" "message" "observable.clj" 198
+    {:clojure true :ns "lamina.core.observable"
+     :fn "lamina.core.observable.ConstantObservable"
+     :file "observable.clj" :line 198 :anon-fn false}]
+   
    ["clojure.lang.Var" "invoke" "Var.java" 123
     {:java true :class "clojure.lang.Var" :method "invoke"
      :file "Var.java" :line 123}]