Silently ignored kwargs in Index.to_series

```
>>> idx = pd.date_range('1994-10-06', freq='D', periods=4)
>>> idx.day.to_series(index=idx)
>>> idx.day.to_series(index=idx)
6    6
7    7
8    8
9    9
```

Expected:

```
>>> idx.day.to_series(index=idx)
1994-10-06    6
1994-10-07    7
1994-10-08    8
1994-10-09    9
```

Looks like Index.to_series takes **kwargs but then ignores them.  Should be an easy fix; would be nice to systematically track down other places this might happen.