prevent atexit handlers from generating crash report

register `sys.excepthook = sys.__excepthook__` with atexit on aplication startup,
so it should be the first handler called.  This removes the crash handler.

closes  #207

IPython/core/application.py

@@ -27,6 +27,7 b' Authors:'
 # Imports
 #-----------------------------------------------------------------------------
 
+import atexit
 import glob
 import logging
 import os
@@ -156,6 +157,9 b' class BaseIPythonApplication(Application):'
         """Create a crash handler, typically setting sys.excepthook to it."""
         self.crash_handler = self.crash_handler_class(self)
         sys.excepthook = self.crash_handler
+        def unset_crashhandler():
+            sys.excepthook = sys.__excepthook__
+        atexit.register(unset_crashhandler)
 
     def _ipython_dir_changed(self, name, old, new):
         if old in sys.path: