Schedule-cronjob

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- Improve docs & clean up docstrings

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- Publish to PyPI as a universal (py2/py3) wheel

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- Add proper HTML (Sphinx) docs available at https://schedule.readthedocs.io/
- CI builds now run against Python 2.7 and 3.5 (3.3 and 3.4 should work fine but are untested)
- Fixed an issue with ``run_all()`` and having more than one job that deletes itself in the same iteration. Thanks alaingilbert.
- Add ability to tag jobs and to cancel jobs by tag. Thanks Zerrossetto.
- Improve schedule docs. Thanks Zerrossetto.
- Additional docs fixes by fkromer and yetingsky.

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- Fixed issues where scheduling a job with a functools.partial as the job function fails. Thanks dylwhich.
- Fixed an issue where scheduling a job to run every >= 2 days would cause the initial execution to happen one day early. Thanks WoLfulus for identifying this and providing a fix.
- Added a FAQ item to describe how to schedule a job that runs only once.

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- Fixed an issue with unicode handling in setup.py that was causing trouble on Python 3 and Debian (https://github.com/dbader/schedule/issues/27). Thanks to waghanza for reporting it.
- Added an FAQ item to describe how to deal with job functions that throw exceptions. Thanks mplewis.

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- Added support for scheduling jobs on specific weekdays. Example: ``schedule.every().tuesday.do(job)`` or ``schedule.every().wednesday.at("13:15").do(job)`` (Thanks abultman.)
- Run tests against Python 2.7 and 3.4. Python 3.3 should continue to work but we're not actively testing it on CI anymore.