fresh install of IPython error .ipython does not exist.

[Carreau]

Full error log https://gist.github.com/Carreau/23793d6fd08d063932d4

But mostly I guess due to ipyparallel missing.

File "/usr/local/Cellar/python3/HEAD/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/tornado/web.py", line 1346, in _execute
        result = method(*self.path_args, **self.path_kwargs)
      File "/usr/local/Cellar/python3/HEAD/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/tornado/web.py", line 2626, in wrapper
        return method(self, *args, **kwargs)
      File "/Users/bussonniermatthias/dev/notebook/jupyter_notebook/services/clusters/handlers.py", line 21, in get
        self.finish(json.dumps(self.cluster_manager.list_profiles()))
      File "/Users/bussonniermatthias/dev/notebook/jupyter_notebook/services/clusters/clustermanager.py", line 81, in list_profiles
        self.update_profiles()
      File "/Users/bussonniermatthias/dev/notebook/jupyter_notebook/services/clusters/clustermanager.py", line 63, in update_profiles
        for profile in list_profiles_in(path):
      File "/Users/bussonniermatthias/dev/ipython/IPython/core/profileapp.py", line 101, in list_profiles_in
        files = os.listdir(path)
    FileNotFoundError: [Errno 2] No such file or directory: '/Users/bussonniermatthias/.ipython'

[minrk]

It used to be a safe assumption that the dir existed, but it isn't anymore. #84 removes that assumption.