Remove `log-ex` middleware - no longer needed

CHANGES.md

@@ -1,5 +1,10 @@
 ## 0.7.0  (2016-NN-NN)
 
+Breaking:
+  - removed middleware `log-ex`. It is no longer needed because browsers now correctly report the 
+    throw site of re-thown exceptions.  In the unlikely event that you absolutely still need it, 
+    the source for `log-ex`is still in `middleware.cljs`, commented out.  Just transfer it to your project.  
+  
 Improvements:
   - added one tick of extra pause when events have `:flush=dom` metadata. Previously, there were odd times when 
     the pause wasn't long enough to ensure redraws. 

src/re_frame/core.cljs

@@ -27,7 +27,6 @@
 (def enrich      middleware/enrich)
 (def trim-v      middleware/trim-v)
 (def after       middleware/after)
-(def log-ex      middleware/log-ex)
 (def on-changes  middleware/on-changes)
 
 

src/re_frame/middleware.cljs

@@ -36,7 +36,7 @@
             (reset! app-db new-db)))))))
 
 
-(defn log-ex
+#_(defn log-ex
   "Middleware which catches and prints any handler-generated exceptions to console.
   Handlers are called from within a core.async go-loop, and core.async produces
   a special kind of hell when in comes to stacktraces. By the time an exception