Clustercron

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* Fixed Python3 unicode compatibility issue for json module.

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* Added Caching of *master selection*.

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* Added option '-o' '--output' for output of wrapped 'cron command'.

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* Add more tests.
* syslog unix_socket path follows symbolic links (fedora)

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* Urllib refactoring with requests.
* Use responses for tests.
* Factored out Mock objects.
* Removed OS X 'open' command from makefile.
* Removed python 2/3 compatibilty module.
* Removed unused exceptions module.

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* Correction in docs/usage.rst