Added support for positional aruments to events.
Useful if you want to use events as callbacks in async coding, getting everything they were called with.
i.e. in tornado IOStream: io_stream.read_until_close(fsm.done_reading)
in the callback for "process_data" state it will be possible to access the data
with e.args[0]
Merge pull request #2 from ctbk/master

Added support for positional aruments to events.