eth/filters: added notifications for out of bound log events

Out of Bound log events are events that were removed due to a fork. When
logs are received the filtering mechanism should check for the `removed`
field on the json structure.

eth/filters/filter.go

@@ -39,7 +39,7 @@ type Filter struct {
 
 	BlockCallback       func(*types.Block, vm.Logs)
 	TransactionCallback func(*types.Transaction)
-	LogsCallback        func(vm.Logs)
+	LogCallback         func(*vm.Log, bool)
 }
 
 // Create a new filter which uses a bloom filter on blocks to figure out whether a particular block