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/background.js

@@ -156,7 +156,7 @@
         });
         var error;
         if ((error = c.validateNumber())) {
-          console.log(error);
+          console.log(error.stack);
           return;
         }
 

js/debugLog.js

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

js/views/recorder_view.js

@@ -70,7 +70,7 @@
             this.recorder.startRecording();
         },
         onError: function(error) {
-            console.log(error);
+            console.log(error.stack);
             this.close();
         }
     });