A Yale scientist says a rock that crashed through the roof of a home in Wolcott, CT was a meteorite.   Police say the owner call them Saturday morning to report his home had been damaged by a falling rock the night before.  It was believed that the object was a piece of runway from a nearby airport.  But Stefan Nicolescu, the collections manager for the Mineralogy Division at the Yale Peabody Museum examined the rock and says it is a meteorite.   He said it likely comes from the Lyrids meteor shower, which happens ever year at the time when Earth crosses the orbit of comet Thatcher.