Missing 1st row after resample
I have a problem with pandas dropping 1st row when I am resampling certain data. Please see the example below. Note that if you advance the last timestamp forward by 1 second it works as expected.

I am using pandas 0.10.1

``` python

import pandas as pd

from datetime import datetime
from StringIO import StringIO


f = StringIO('''\
time,value
2011-06-03 00:00:05,0
2011-06-03 00:01:05,1
2011-06-03 00:02:05,2
''')

series = pd.read_csv(f, parse_dates=True, index_col=0)['value']

print series
# time
#2011-06-03 00:00:05    0
#2011-06-03 00:01:05    1
#2011-06-03 00:02:05    2
# Name: value

# Problem resampling: 1st sample is missing

print series.resample('s')
# time
#2011-06-03 00:00:06   NaN
#2011-06-03 00:00:07   NaN
#2011-06-03 00:00:08   NaN
#2011-06-03 00:00:09   NaN
# ...
#2011-06-03 00:01:52   NaN
#2011-06-03 00:02:03   NaN
#2011-06-03 00:02:04   NaN
#2011-06-03 00:02:05     2
#2011-06-03 00:02:06   NaN
# Freq: S, Name: value, Length: 121
```
