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.
Update IrrigationControllerDeviceType.groovy

Adds ability to switch Irrigation Zone 8 to a Master Valve or Pump switch.  
If you press the "pump tile", it will automagically reactive Zone 8
The Arduino will now turn on relay 8 any time Zones (relays) 1-7 are on.
Relay 8 will stay on while zones progress from 1-7 and then turns off after all irrigation zones have completed

Also tweaked  return function in parse (line 186) which seems to further enhance tile performance
Merge pull request #21 from d8adrvn/Arduino-Pump-Control

Arduino pump control