Timezone Problem in MultiIndexing
```
dt = datetime.datetime(2014,11,24,12,0,0)
dt = dt.replace(tzinfo=td.CHICAGO_TZ)
mi = pd.MultiIndex.from_product([[dt],[1],[2]])
print mi
print 
print mi.get_level_values(0)[0]
print 
```

When I use get_level_values function and try to filter dataframe based on time index(which is the first level), it always loses the tzinfo. Surely I can add tzinfo back after calling the function, but is there a better way of dealing with this?
