Problems with subarray indexing for >2-dimensional arrays.

This works as expected

```
a = randn(3,4)
x = sub(a, 1:size(a,1), 4)
x[1:3] = 1.
a
```

this not

```
a = randn(3,4,5)
x = sub(a, 1:size(a,1), 1:size(a,2), 5)
x[1:3, 1:4] = 1.
 ERROR: BoundsError()
 in translate_indexes at subarray.jl:205
 in setindex! at subarray.jl:304
```
