from [SO](http://stackoverflow.com/questions/21599633/how-to-create-a-pandas-timestamp-object) `Timestamp(year, month, day, second, millisecond, microsecond, nanosecond)` as optional keyword args might be nice for compat with `datetime.datetime`. We do something similar for `Timedelta` construction.