Concert

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Released on July 14th 2013.

- Move third-party code to ``concert.ext``. For example ``get_tomo_scan_result``
must be imported from ``concert.ext.nexus``.
- Adds ``concert fetch`` to pull session files from remote locations.
- Code cleanup

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Bug fix release, released on May 25th 2013

- Fixes Python 3 support.
- Monochromator fix.

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First public release.