Adding single-element Time to multielement TimeDelta silently ignores all but first item

I'm trying to construct a range of times as follows:
```
import numpy as np
from astropy.time import Time
t1 = Time('2013-06-01', scale='utc')
dt = TimeDelta(np.arange(1,4), format='jd')
t = t1+dt
```
But this leaves `t` as a single value, `t1+dt[0]` (well, first element of `dt` anyway, `__getitem__` not yet being implemented).