Start exercising grow code, breaking the VM

grow/main.go

@@ -17,10 +17,10 @@ func main() {
 		log.Fatal(err)
 	}
 
-	def, err := loadDefinition(defFile)
+	def, err := NewDefinition(defFile)
 	if err != nil {
 		log.Fatal(err)
 	}
 
-	log.Printf("%+v", def)
+	def.Grow()
 }