Removed old callers import

sjrpc/core/__init__.py

@@ -18,9 +18,7 @@ It also contains a sub-package containing protocols: :mod:`core.protocols`.
 '''
 
 from sjrpc.core.rpcconnection import *
-from sjrpc.core.callers import *
 from sjrpc.core.exceptions import *
 from sjrpc.core.async import *
 
-__all__ = ('RpcConnection', 'RpcCaller',
-           'ThreadedRpcCaller', 'RpcError', 'AsyncWatcher')
+__all__ = ('RpcConnection', 'RpcError', 'AsyncWatcher')