DatetimeIndex.repeat needs to be overridden
```
(Pdb) rng
<class 'pandas.tseries.index.DatetimeIndex'>
freq: <1 Day>, timezone: None
[2000-01-01 00:00:00, ..., 2000-01-31 00:00:00]
length: 31
(Pdb) rng2 = rng.repeat(5)
(Pdb) rng2
<class 'pandas.tseries.index.DatetimeIndex'>
freq: <1 Day>, timezone: None
[2000-01-01 00:00:00, ..., 2000-01-31 00:00:00]
length: 155
```
