POSIT does not properly offset Z axis. 

```
The POSIT implementation in math.geometry doesn't offset the Z axis (with 
temp.Z), like it does for the X and Y axes. This will result in the object pose 
having the wrong Z distance and rotating around a blatantly wrong point. 
```

Original issue reported on code.google.com by `iKr...@gmail.com` on 18 Aug 2015 at 3:58
