Use error.stack instead of error for console log

Chrome/V8 give you the error name, message and callstack at that
property, where toString() gives you [object NavigatorUserMediaError]

FREEBIE

js/debugLog.js

@@ -71,7 +71,7 @@
         };
 
         window.onerror = function(message, script, line, col, error) {
-            console.log(error);
+            console.log(error.stack);
         };
     }
 })();