NPE thrown if connecting to bin log at 'mutation' event

[JohnFirth]

In AbstractRowsEventDataDeserializer.deserializeRow(),
TableMapEventData tableMapEvent = tableMapEventByTableId.get(tableId) returns null if no table map events have preceded the mutation event (DeleteRowsEvent, UpdateRowsEvent, WriteRowsEvent) in question; this leads to an NPE from byte[] types = tableMapEvent.getColumnTypes();

[shyiko]

Thank you, John.
BinaryLogClient will be updated to take care of that problem transparently once #53 is resolved.