I thought this would work:
```
apertures = photutils.CircularAperture([1, 2, 3, 4])
flux = photutils.aperture_circular(data, xc, yc, apertures)
```
but it currently doesn't:
```
ValueError: trailing dimension of 'apertures' must match the length of xc, yc
```

@astrofrog I guess for now, until the API has been changed to allow the simple code of having an `Aperture` represent an array of apertures, updating the docs as written here is OK?