BUG: reindex on index in a frame using a not-None method is buggy
reported here:

http://stackoverflow.com/questions/20459782/what-is-the-functionality-of-the-filling-method-when-reindexing

does not appear to be any tests for it, nor is fix that trivial

```
import pandas as pd
import numpy as np

hf_index = pd.date_range(start='2013-05-09 9:00', end='2013-05-13 23:59', freq='1min')
hf_prices = np.random.rand(len(hf_index))
hf = pd.DataFrame(hf_prices, index=hf_index)
hf.ix['2013-05-10 18:00':'2013-05-13 18:00',:]=np.nan
ind_daily = pd.date_range(start='2013-05-09 16:00', end='2013-05-13 16:00', freq='B')
daily1 = hf.reindex(index=ind_daily, method='ffill')
```
