remove cron - Put all scheduling in Python itself

[Michael Andreacchio]

EGs: https://pythonhosted.org/APScheduler/cronschedule.html https://pypi.python.org/pypi/python-crontab https://code.google.com/p/scheduler-py/ https://pypi.python.org/pypi/APScheduler/1.01 http://www.celeryproject.org/ http://python-rq.org/ http://docs.python.org/2/library/sched.html