TimeSeries.resample how='last' & 'first' broken?
'Last' seems to be 'first', but what 'first' is doing I can't figure out...

pd.**version**
Out[79]: '0.8.1'

rng8h = pd.date_range('1/1/12', periods=10, freq='8H')
rng8h
Out[70]: 
<class 'pandas.tseries.index.DatetimeIndex'>
[2012-01-01 00:00:00, ..., 2012-01-04 00:00:00]
Length: 10, Freq: 8H, Timezone: None

ts8h = Series(randn(len(rng8h)), index=rng8h)
ts8h
Out[75]: 
2012-01-01 00:00:00    0.546799
2012-01-01 08:00:00    0.272687
2012-01-01 16:00:00   -0.730920
2012-01-02 00:00:00   -0.121706
2012-01-02 08:00:00   -1.670595
2012-01-02 16:00:00    1.415328
2012-01-03 00:00:00   -0.433233
2012-01-03 08:00:00    0.340239
2012-01-03 16:00:00   -0.186495
2012-01-04 00:00:00    0.689044
Freq: 8H

ts8h.resample('D', how='first')
Out[76]: 
2012-01-01    0.546799
2012-01-02    0.272687
2012-01-03   -1.670595 
2012-01-04    0.340239
Freq: D

ts8h.resample('D', how='last')
Out[77]: 
2012-01-01    0.546799
2012-01-02   -0.121706
2012-01-03   -0.433233
2012-01-04    0.689044
Freq: D
