Zkpytb

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* Add tests for zkpytb.logging

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* zkpytb.dicts: add hashdict() helper.

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* zkpytb.pandas: only try to import statsmodels when using mad()
* Minor changes missed while relasing previous version.

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* Add an implementation of PriorityQueue based on heapqueue in zkpytb.priorityqueue
* Add mad(c) (median absolute deviation) and percentile(q) functions in zkpytb.pandas
* Add code coverage and coveralls
* Add tests for zkpytb.pandas
* Fix requirements_dev.txt because pandas>=0.21 is not compatible with py34

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* zkpytb.utils: add hashstring() and get_git_hash() helpers.
* Add tests for zkpytb.dicts and zkpytb.utils modules.

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* Add first version of zkpytb.logging module with function setup_simple_console_and_file_logger().