Optimize functions decorator (#129)

Author: tonybaloney

azure/functions/decorators/function_app.py

@@ -100,8 +100,8 @@ def get_bindings(self) -> List[Binding]:
         return self._bindings
 
     def get_raw_bindings(self) -> List[str]:
-        return [json.dumps(i, cls=StringifyEnumJsonEncoder) for i in
-                self.get_bindings_dict()["bindings"]]
+        return [json.dumps(b.get_dict_repr(), cls=StringifyEnumJsonEncoder)
+                for b in self._bindings]
 
     def get_bindings_dict(self) -> Dict:
         """Get dictionary representation of the bindings of the function.