Update ArduinoSmartShieldIrrigationController.ino

Add Pump Control Options:
Now has ability to add an additional single relay to pin13 to activate a master valve or relay.  Once added, you must set isPin13Pump to "true" on line 228.

Also added additional wiring diagrams and warnings about working with high voltage pump

Lastly, tweaked the timer functions that double check the queue for work to do.  Fixes a conflict that interfered with reporting the controller status every 10 min.