More work to address review comments....
More work to address review comments.
* Moved twisted import to top-level of :mod:`IPython.kernel.error` (r1333).
* Added docstring about :meth:`InteractiveShell.load_extension` returning
whatever the return value of :func:`load_ipython_extension` is.
* Renamed the :attr:`user_config_ns` attribute to :attr:`user_ns_hidden` to
better reflect what it does.
* Moved the ``%HOME`` to the end of home directory options attemped in
:func:`IPython.utils.path.get_home_dir` on Windows.
