Release 0.6.6 - 2014/12/22
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* Improvements
    * Detect logger configuration error on startup (#895, #902)


Release 0.0.7 - 2014/12/22
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* Improvements
    * Remove error-prone default constructor (#72, #80)

* Bug fix
    * random_unlearner now take care of entries deleted by user (#60, #79)