[fix bug 974344] Don't display ical banner when subscribing to past events.
[fix bug 974344] Don't display ical banner when subscribing to past events.

mozilla/remo,akatsoulas/remo,abdullah2891/remo,flamingspaz/remo,abdullah2891/remo,tsmrachel/remo,tsmrachel/remo,flamingspaz/remo,johngian/remo,Mte90/remo,Mte90/remo,Mte90/remo,mozilla/remo,akatsoulas/remo,johngian/remo,flamingspaz/remo,mozilla/remo,chirilo/remo,akatsoulas/remo,flamingspaz/remo,johngian/remo,akatsoulas/remo,tsmrachel/remo,chirilo/remo,mozilla/remo,Mte90/remo,abdullah2891/remo,chirilo/remo,abdullah2891/remo,johngian/remo,chirilo/remo,tsmrachel/remo