Ipdb

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- Fix Restart error when using `python -m ipdb`
Closes https://github.com/gotcha/ipdb/issues/93.
[gotcha]

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- Don't require users to pass a traceback to post_mortem.
[Wilfred]

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- Closes https://github.com/gotcha/ipdb/issues/93.
[gotcha]

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- Reset ``sys.modules['__main__']`` to original value.
Closes https://github.com/gotcha/ipdb/issues/85
[gotcha]

- Fix support of IPython versions 0.x
[asivokon]

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- Switch to revised BSD license (with approval of all contributors).
Closes https://github.com/gotcha/ipdb/issues/68
[lebedov, gotcha]

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- Don't pass sys.argv to IPython for configuration.
[emulbreh]