Updated Spire tag to 0.3.1.
Updated Spire tag to 0.3.1.

0.3.1 includes proper GL resource cleanup.

collint8/SCIRun,jcollfont/SCIRun,ajanson/SCIRun,jessdtate/SCIRun,jessdtate/SCIRun,jessdtate/SCIRun,jcollfont/SCIRun,ajanson/SCIRun,ajanson/SCIRun,collint8/SCIRun,jcollfont/SCIRun,jessdtate/SCIRun,moritzdannhauer/SCIRunGUIPrototype,collint8/SCIRun,ajanson/SCIRun,moritzdannhauer/SCIRunGUIPrototype,collint8/SCIRun,ajanson/SCIRun,moritzdannhauer/SCIRunGUIPrototype,ajanson/SCIRun,moritzdannhauer/SCIRunGUIPrototype,collint8/SCIRun,jcollfont/SCIRun,jessdtate/SCIRun,jcollfont/SCIRun,ajanson/SCIRun,collint8/SCIRun,collint8/SCIRun,jessdtate/SCIRun,jcollfont/SCIRun,collint8/SCIRun,jcollfont/SCIRun,moritzdannhauer/SCIRunGUIPrototype,jessdtate/SCIRun,moritzdannhauer/SCIRunGUIPrototype,jessdtate/SCIRun,moritzdannhauer/SCIRunGUIPrototype