as_index in GroupBy still not fully implemented
``` python
df = DataFrame({'A' : ['foo', 'bar', 'foo', 'bar',
                          'foo', 'bar', 'foo', 'foo'],
                   'B' : ['one', 'one', 'two', 'three',
                          'two', 'two', 'one', 'three'],
                   'C' : randn(8), 'D' : randn(8)})
df
   grouped = df.groupby('A')
grouped = df.groupby('A')
grouped.agg(np.sum)
grouped = df.groupby('A', as_index=False)
grouped.agg(np.sum)
grouped.sum()
```

Adding @laserson so notifications go through
