MobilizeSimple::do broken with mosaic 0.9+

With `mosaic 0.8-3`

``` R
> MobilizeSimple::do(2)*print('hi')
[1] "hi"
[1] "hi"
[1] "hi"
  V1
1 hi
2 hi
```

With `mosaic 0.9.2-2`

``` R
> MobilizeSimple::do(2)*print('hi')
Error in Do(n = object, ...) : 
  formal argument "n" matched by multiple actual arguments
```
