Cannot resample('M') after tz_convert
Update: I believe this has been fixed in v.0.10.0, so it can be closed.

In Pandas v.0.9.0:

``` python
dd=pd.date_range('2012-1-1 1:30', periods=3, freq='min').tz_localize('UTC').tz_convert('EST')
pd.Series([1,2,3],index=dd).resample('M')
```

Output: 

```
Exception: Cannot compare tz-naive and tz-aware timestamps
```
