Vimpdb

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- polish documentation.

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- tune documentation.

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- check ``python`` and ``clientserver`` support; gives a chance to provide right
configuration if support is missing.

- try to launch a VIM server instance if none is running.

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- tested with Python 2.7.

- UDP port is now an option.

- configuration through ``~/.vimpdbrc`` instead of environment variables.

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- fix: some versions of VIM need explicit import of vim module
even though most don't.
(http://github.com/gotcha/vimpdb/issues/issue/5)

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- fix: could not go ``down`` after switching from ``pdb`` to
**vimpdb** after having gone ``up``.
(http://github.com/gotcha/vimpdb/issues/issue/4)