Use new entry point for python -m IPython

IPython/__main__.py

@@ -1,14 +1,14 b''
 # encoding: utf-8
 """Terminal-based IPython entry point.
 """
 #-----------------------------------------------------------------------------
 #  Copyright (c) 2012, IPython Development Team.
 #
 #  Distributed under the terms of the Modified BSD License.
 #
 #  The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
-from IPython.terminal.ipapp import launch_new_instance
+from IPython import start_ipython
 
-launch_new_instance()
+start_ipython()