app.name shall be __main__ for console apps

flask/app.py

@@ -466,7 +466,7 @@ class Flask(_PackageBoundObject):
         if self.import_name == '__main__':
             fn = getattr(sys.modules['__main__'], '__file__', None)
             if fn is None:
-                return 'unknown'
+                return '__main__'
             return os.path.splitext(os.path.basename(fn))[0]
         return self.import_name