Ditched celery beat in favor of much simpler "Advanced Python Scheduler"

* All periodically executed tasks moved to scheduler.py, which can be run as an upstart task similar to powerpool
* Payouts are now not triggered by block finds, but just processed for all blocks every 60 seconds
* A decorator for all tasks was added that logs to the cache runtime and last exec time for future addition to a debugging view on the site
* Transaction confirmation crontab was removed completely in favor of using the RPC method for confirming transactions
* An unhandled exception in block confirmation code is now properly handled

Conflicts:
	simplecoin/tasks.py
Fixes refactor mistake from moving to separate scheduler
Adds a simple display for viewing crontab timeing and lastrun data
Oops
Adds missing minor crontab deocrator
Big improvement to overall quality of RPC service
* If payout fails because insufficient funds, ids get automatically unlocked
* Locked ids are now recorded as json in a file, as opposed to spitting out to command line
* Association of paid payouts with transaction is retried 5 times, finally saving the data to json file for manual retry later
* Two new commands allow unlocking pids/bids and associating transaction id from json file